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(Reuters) - Facebook fired back on Tuesday in its legal battle with Yahoo by accusing the Web pioneer of infringing 10 of Facebook's patents, according to a court filing.

The counterclaim from Facebook, filed in a San Francisco federal court, comes after Yahoo a sued Facebook for patent infringement last month.

The dueling claims mark an expanding web of patent litigation that has already caught up the smartphone and tablet sectors and high-tech stalwarts such as Apple Inc, Microsoft Corp and Motorola Mobility Holdings Inc.

Yahoo's lawsuit against Facebook came at a delicate time, as the world's largest Internet social networking service is preparing for an initial public offering that could value the company at up to $100 billion.

Observers have said that companies are usually more vulnerable to patent suits when they are in the IPO process, as investors scrutinize the risks involved in the business.

But Facebook's counterclaim comes as Yahoo addresses its own challenges: the Web pioneer has seen declining revenue, and newly installed Chief Executive Scott Thompson is facing a contentious proxy fight with activist hedge fund Third Point.

Yahoo spokesman Eric Berman said Facebook's counterclaim is "nothing more than a cynical attempt to distract from the weakness of its defense."

Five of the patents asserted by Facebook target features related to Yahoo's online advertising business, which Facebook pegged at 80 percent of Yahoo's 2011 revenue, according to the counterclaim.

Yahoo's Flickr photo sharing service infringed various Facebook patents involving the ability to connect with other users on the online service, to identify people in a photo and to generate personalized news feeds, according to the filing.

At least one of the patents asserted by Facebook -- a method for tagging digital media -- lists its chief executive, Mark Zuckerberg, as one of the inventors, according to a U.S. government database.

Facebook General Counsel Ted Ullyot said the company had indicated that it would defend itself vigorously in the face of Yahoo's lawsuit.

"While we are asserting patent claims of our own, we do so in response to Yahoo's short-sighted decision to attack one of its partners and prioritize litigation over innovation," Ullyot said in a statement.

Yahoo has claimed Facebook infringed 10 of Yahoo's patents, including several that cover online advertising technology. In its lawsuit, Yahoo said Facebook was considered "one of the worst performing sites for advertising" prior to adapting Yahoo's ideas.

The case in U.S. District Court, Northern District of California is Yahoo Inc. v. Facebook Inc., 12-cv-1212.

Yahoo shares fell 2.4 percent to $15.09 in afternoon trading on Tuesday.

Jeremy Lin will miss the rest of the regular season because he needs knee surgery that will sideline him six weeks and could leave the Knicks without their star point guard in the playoffs - if they make it that far.

Lin had an MRI exam this week that revealed a small, chronic meniscus tear and he has elected to have surgery next week in New York.

With the regular season ending April 26, the biggest story in basketball this season is done unless the Knicks make a deep postseason run.

Speaking slowly during a pregame press conference, Lin was unable to hide his disappointment with the decision that was reached earlier Saturday after a painful workout.

“It (stinks) not being able to be out there with the team,” he said.

Upcoming: Lin-surgery.

He was barely holding on to a place in the NBA back in February. Now, after the back-to-back Sports Illustrated covers and popularity around the world, and now it’s over.

“If this was done very early in the year, obviously … I don’t know where my career would be. I could be, would be definitely without a job and probably fighting for a summer league spot,” Lin said. “But having said that, this happening now hurts just as much, because all the players, we really put our heart and souls into the team and into season, and to not be there when it really matters most is hard.”

The Knicks will continue to turn to Baron Davis in place of Lin, the undrafted Harvard alum who became the starter in February and turned in a series of brilliant performances, kicking off a phenomenon that was called Linsanity.

Lin is averaging 14.1 points and 6.1 assists, but the numbers only tell a small part of the story.

The Knicks were under .500 and looking like a mess when Lin was given a chance to play extended minutes at point guard for then-coach Mike D’Antoni on Feb. 4 against New Jersey.

Lin, the first American-born player of Taiwanese or Chinese descent to play in the NBA, scored 25 points with seven assists in that New York victory, was inserted into the starting lineup two days later against Utah, and took the Knicks on a seven-game winning streak that gained world-wide attention.

The 23-year-old Lin left the Knicks’ easy victory over Detroit last Saturday after feeling discomfort, saying afterward he could have returned for the fourth quarter if the game had been close. He took part in shootaround before their game Monday and at first believed he could deal with the pain.

Though the swelling went down, the pain never did. He said he got three or four opinions that all said the same thing, and after testing it again Friday and Saturday, he decided to have the surgery.

“I can’t really do much. Can’t really cut or jump, so it’s pretty clear that I won’t be able to help the team unless I get this fixed right now,” Lin said before the Knicks played Cleveland. “It’s disappointing for me, it’s hard to watch the games and I think I’d want to be out there obviously more than anything right now. But hopefully, it’s a six-week rehab process but I tend to heal fast, so hopefully I can come back as soon as possible and still contribute this season hopefully.”

It’s the second serious injury loss of the week for the Knicks, who are in eighth place in the Eastern Conference. Amare Stoudemire is out two to four weeks with a back injury, leaving the Knicks without their second- and third-leading scorers for perhaps the remainder of the regular season.

Davis still isn’t 100 percent after a herniated disk in his back kept him out of action until February. The Knicks also have Mike Bibby and Toney Douglas, plus rookie Iman Shumpert as point guard options, but none as good as Lin.

“We’ve got to go on, but he’s a big piece of our puzzle and what we were doing as of late before he actually went out,” interim coach Mike Woodson said. “All’s not bad. Again, we’ve got three veteran point guards sitting over there and the rookie we could play some at the point. We’re just going to have to make do until he’s able to get back into uniform. But it is a big blow.”

Lin flourished in D’Antoni’s offense, and there was immediate speculation he would struggle - or even lose his starting spot - when Woodson replaced him on March 14. Instead, Lin kept on rolling, leading the Knicks to six wins in seven games before he was hurt.

Woodson said he’s known of players that have played through meniscus tears, but that only Lin knows his body. Lin knew he would need surgery eventually, but hoped to delay it until after the season.

“He’s elected to have the surgery and we’ve got to respect that, because only he knows the pain that he’s feeling. And there is a problem, so it’s got to be fixed,” Woodson said.

The Knicks had already tried three point guards when they finally turned to Lin, who had been cut by Golden State and Houston before signing with the Knicks. D’Antoni immediately elevated him to the starting lineup after his performance against the Nets, and Lin responded with the greatest beginning stretch ever for a starter.

He was the first player with at least 20 points and seven assists in each of his first five starts since the Elias Sports Bureau began charting starts in 1970. He had a 3-pointer to win a game in Toronto, scored 38 points to outplay Kobe Bryant in a national TV victory over the Lakers, then had 28 points and 14 assists in another nationally televised victory over the NBA champion Dallas Mavericks.

All along, the frenzy around him increased. Commissioner David Stern said he had never seen so much interest created by one player in such a short period of time. Knicks games were picked up by TV stations in basketball-crazed Asia, and Lin actually pleaded for privacy for his family in Taiwan.

Lin will be a free agent after the season and said he hopes to return to New York, but otherwise wasn’t thinking that far in the future.

“I’m not even worried about that right now,” he said. “It’s not like a career-ending thing or it’s not something that will bother me. Once it’s fixed, it’s fixed, it’s the most simple surgery you can have and so I’m more concerned about the season.”

(Reuters) - Yahoo Inc co-founder Jerry Yang has quit the company he started in 1995, appeasing shareholders who had blasted the Internet pioneer for pursuing an ineffective personal vision and impeding investment deals that could have transformed the struggling company.

Yang's abrupt departure comes two weeks after Yahoo appointed Scott Thompson its new CEO, with a mandate to return the once-leading Internet portal to the heights it enjoyed in the 1990s.

Wall Street views the exit of "Chief Yahoo" Yang as smoothing the way for a major infusion of cash from private equity, or a deal to sell off much of its 40 percent slice of China's Alibaba, unlocking value for shareholders.

"Everyone is going to assume this means a deal is more likely with the Asia counterparts," Macquarie analyst Ben Schacter said. "The perception among shareholders was Jerry was more focused on trying to rebuild Yahoo than necessarily on maximizing near-term shareholder value.

"It certainly seems things are coming to a head as far as realizing the value of these assets."

Yang, who is severing all formal ties with the company by resigning all positions including his seat on the board of directors, has come under fire for his handling of company affairs dating back to an aborted sale to Microsoft in 2008.

Yang's exit comes roughly a month before dissident shareholders can nominate rival directors to Yahoo's board.

The remaining nine members of Yahoo's board, which includes Hewlett-Packard executive Vyomesh Joshi and private investor Gary Wilson, are all up for reelection this year.

Yang's departure could be part of a broader board shakeup, said Ryan Jacob, chairman and chief investment officer of Jacob Funds, which owns Yahoo shares.

"If they don't move quickly on these things, they run the risk of a proxy battle and they are doing everything they can to avoid that."

The company did not say where Yang was headed or why he had suddenly resigned. CEO Thompson offered few clues in a memo to employees obtained by Reuters following the announcement.

"I am grateful for the support and warm welcome Jerry provided me in my early days here. His insights and perspective were invaluable, helping me to dig deeper, more quickly than I could have on my own, into some of the key elements of the company and how it operates.

Yang and co-founder David Filo, both of whom carried the official title "Chief Yahoo," own sizable stakes in the company. Yang owns 3.69 percent of Yahoo's outstanding shares, while Filo owns 6 percent as of April and May 2011.

In a letter to Yahoo's chairman of the board, Yang said he was leaving to pursue "other interests outside of Yahoo" and was "enthusiastic" about Thompson as the choice to helm the company.

Yang, 43, is also resigning from the boards of Yahoo Japan and Alibaba Group Holdings.

Respected in the industry as one of the founding figures of the Web, Yang has come under fire over the years from investors and to some extent within the company's internal ranks.

"Lots of people think he holds up innovation there with old ideas and (is) slow to decide and that he's not an innovator himself for being at such a high level," said one former Yahoo employee.

"People have very high expectations for founders. Everyone wants a Steve Jobs," the employee said, referring to Apple's co-founder who brought the company back from near death and transformed it into the world's most valuable tech company.

Some analysts say the Yahoo board's indecision stems in part from Yang's sway in the company. Disillusioned by the company's flip-flopping, they warn that the rest of the board remained much the same as the one that rejected Microsoft's unsolicited takeover bid when Yang was CEO.

"Jerry Yang was certainly an impediment toward anything happening," said Morningstar analyst Rick Summer. "This is a company that's been mired by a bunch of competing interests going in different directions. It was never clear what this board's direction has been."

Microsoft's bid was worth about $44 billion. Its share price was subsequently pummeled by the global financial crisis and its current market value stands at about $20 billion.

More recently, Yang and Yahoo chairman Roy Bostock have incurred the wrath of some major Yahoo shareholders for their handling of the "strategic review" the company was pursuing, in which discussions have included the possibility of being sold, taken private or broken up.

Yang's efforts to seek a minority investment in Yahoo from private equity firms enraged several large shareholders, including hedge fund Third Point, which accused Yang of pursuing a deal that was in "his best personal interests" but not aligned with shareholders' interests.

Yahoo has also been exploring a deal to unload most of its prized Asian assets in a complex deal involving Alibaba, valued at roughly $17 billion, sources told Reuters last month.

Alibaba Group's founder, Jack Ma, whose personal relationship with Yang led to Yahoo buying a 40 percent stake in Alibaba in 2005, said he looked forward to continuing a "constructive relationship" with Yahoo.

Susquehanna analyst Herman Leung said: "I had thought that Jerry Yang was a lifer at Yahoo.

"Without him on the board, this could smooth a potential transaction. What that transaction is, is any of our guesses right now."

Jan 4 (Reuters) - Yahoo named PayPal President Scott Thompson as its chief executive on Wednesday, hoping the well-regarded Internet technology and e-commerce expert will replicate his success at eBay Inc and turn around the struggling company.

Thompson, credited with driving growth at eBay's online payments division PayPal, joins Yahoo during a period of turmoil, as the company plows ahead with a strategic review in which discussions have included the possibility of being sold, taken private or broken up.

Shares of Yahoo were down about 2 percent in mid-morning trading, as Wall Street assessed how Thompson's hiring would affect the hopes of some investors that Yahoo would be sold or spin off its Asian assets, as well as how Thompson's background fits in with Yahoo's core online media business.

"It's a positive outcome, but not as positive as a sale of the company," said Lawrence Haverty, a fund manager with GAMCO investors, which owns Yahoo shares.

"The risk element is that his background was in payments. And this is not a payment company; it's a marketing, technology company," he said.

Thompson, a former Visa payments software platform designer, joins the company four months after the firing of previous CEO Carol Bartz as the one-time Web powerhouse Yahoo struggles to compete with newer heavyweights Google Inc and Facebook.

"I'm from Boston, we're the underdogs since the beginning of time. Hopefully that spirit has held through. I like doing complicated, very difficult, very challenging things," Thompson said in an interview.

Thompson, who takes over on January 9, will also join Yahoo's board. He ran eBay's PayPal since early 2008, and was previously its chief technology officer. Under his leadership, Yahoo said PayPal increased its user base from 50 million to more than 104 million active users. PayPal processed $29 billion in payments in the third quarter of 2011.

EBay's shares fell 3.5 percent as analysts said the online retailer would miss the respected Internet executive.

EBay Chief Executive John Donahoe told staff in an internal memo that Thompson's move was a "shock."

"Scott informed me Tuesday afternoon, saying that despite his passion for PayPal, this was an opportunity he felt he had to take," Donahoe said.

At PayPal, Thompson was known as a leader who was not afraid to make bold strategic bets. He came up with the idea of taking PayPal beyond its online stronghold and into the physical world by allowing PayPal payments in retail stores -- an opportunity analysts believe could prove much bigger than its existing business.

That kind of strategic risk-talking could be particularly useful at Yahoo. The Sunnyvale, California-based company, whose services include mail, search, news and photo-sharing, was a Web pioneer that grew rapidly in the 1990s. But in recent years, Yahoo has struggled to maintain its relevance and advertising revenue in the face of competition from rivals Google and Facebook.

"They really need that push to the next level," said Ryan Jacob, chairman and chief investment officer of Jacob Funds, which includes the Jacob Internet Fund and counts Yahoo as one of its largest positions.

"Ideally what they would do is rather than just follow where today's Internet leaders are moving, try to really be on that front edge," he said, citing Yahoo's need be better positioned in mobile, social networking and other fast-growing technology trends.

During a conference call on Wednesday, Thompson cited mobile as a key area that he expected to focus on at Yahoo, and he said he viewed the company's treasure trove data about its users as one of Yahoo's key assets. But he said it was too early to comment on his overall vision for the company.

Yahoo Chairman Roy Bostock told analysts on the joint conference call with Thompson that Yahoo has no intention of being taken private.

Bostock also said Thompson would not be distracted by decisions related to the Asian assets.

Yahoo recently has been discussing slashing its stakes in China's Alibaba Group and its Japanese affiliate as part of a share deal worth about $17 billion, according to sources familiar with the situation.

Alibaba has also hired a Washington lobbying firm in a sign that the Chinese e-commerce company would be willing to make a bid for all of Yahoo in the event that talks to unwind their Asian partnership fail.

Several Yahoo investors said they believed the plans to spin off the Asian assets would remain on track with Thompson at the helm.

"If they can successfully complete the Asian asset transactions, in a way that is beneficial to Yahoo shareholders, I think it will buy them some time and they'll have a chance to build for growth," said Jacob, of the Jacob Funds.

"The sale of the Asian assets is what happens first and what happens afterwards is just a question of how they deploy the cash they get from the sale," said Jordan Rohan, an analyst at Stifel Nicolaus.

In 2008, Yahoo rejected an unsolicited takeover bid from Microsoft worth about $44 billion. Its share price was subsequently pummeled during the global financial crisis and its current market value is about $20 billion.

Co-founder Jerry Yang stepped down in late 2008 after being severely criticized by investors for his handling of the bid. The company cut thousands of jobs and later agreed to an advertising and search partnership with Microsoft.

Thompson said in an interview that Yahoo was in a strong position with its large user base of more than 700 million people.

"The traffic itself that these sites generate is a very big number, the collection of assets that sit below this core business I think are not well understood and clearly have tremendous opportunity to be leveraged as we look forward to the future."

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Iran's Press TV on Thursday broadcast an extended video tour of the U.S. spy drone that went down in the country--and it indeed appeared to look mostly intact.

American officials have acknowledged that an unmanned U.S. reconnaissance plane was lost on a mission late last week, but have insisted that there is no evidence the drone was downed by hostile acts by Iran. Rather, they said, the drone likely went down because of a malfunction, and they implied the advanced stealth reconnaissance plane would likely have fallen from such a high altitude--the RQ-170 Sentinel can fly as high as 50,000 feet--that it wouldn't be in good shape.

But Iranian military officials have claimed since Sunday that they brought down an American spy drone that was little damaged. And now they have provided the first visual images of what looks to be a drone that at least outwardly appears to be in decent condition, in what is surely another humiliating poke in the eye for U.S. national security agencies.

The Pentagon declined to comment on the released images Thursday, a Defense Department spokesman told Yahoo News. But military analysts said it appeared to them to be the American drone in question.

"I have been doing this for thirty years, and it sure looks like" a stealthy U.S. drone to me," Loren Thompson, a military analyst with the Lexington Institute and consultant to the RQ-170's manufacturer, Lockheed Martin, told Yahoo News in a telephone interview Thursday. "I think we are going to face the high likelihood that Iran has an intact version of one of our most important intelligence gathering tools."

Still, Thompson went on, the intelligence "windfall" to Iran from obtaining the advanced U.S. stealthy drone may be mitigated.

"I don't think the Iranians get as much out of it as they might hope," he said. "It probably came into their hands as a result of a technical malfunction. What that means is they still don't have a real defense against the U.S. flying other vehicles that have similar capabilities, without much fear of interception."

Analysts also noted that the video of the drone released by Iran did not show the drone's underside. "Pretty intact," the Center for Strategic and International Studies' James Lewis said by email. "Interesting that they covered the underside."

The New York Times reported Thursday that--unsurprisingly--the RQ-170 was lost while making the latest foray over Iran during an extended CIA surveillance effort of Iran's nuclear and ballistic weapons program.

"The overflights by the bat-winged RQ-170 Sentinel, built by Lockheed Martin and first glimpsed on an airfield in Kandahar, Afghanistan, in 2009, are part of an increasingly aggressive intelligence collection program aimed at Iran, current and former officials say," the Times' Scott Shane and David Sanger wrote. "The urgency of the effort has been underscored by a recent public debate in Israel about whether time is running out for a military strike to slow Iran's progress toward a nuclear weapon."

Iran in turn has complained that the drone overflights represent an act of aggression and violation of its sovereignty, and summoned the Swiss envoy--who represents U.S. interests in Iran--on Thursday to lodge a protest.

However, while the images of the U.S. drone surely allowed Iran to score another public relations blow against Washington, Iran may find it tough to generate much in the way of international sympathy for being the target of U.S. surveillance.

Last week, Iranian hardliners ransacked the British embassy in Tehran, prompting the United Kingdom to recall its diplomatic staff from Tehran and order Iran's embassy in London closed. Last month, the UN atomic watchdog agency issued a report raising concerns about research Iran is suspected by some nations to have conducted before 2003 on military aspects of its nuclear program. Iran has insisted its nuclear program is for peaceful energy purposes. In October, the United States accused elements of Iran's Qods force of plotting to assassinate the Saudi envoy to the United States. The United Nations General Assembly voted last month in favor of a resolution condemning the Iranian plot.

Amid its growing international isolation, Iran, unsurprisingly, seemed intent to play up the drone incident for all it could.

"China, Russia want to inspect downed U.S. drone," proclaimed a headline from Iran's Mehr news agency Thursday.

The RQ-170 Sentinel, however, reportedly did not use the latest U.S. surveillance technology on board, in part because as a single-engine aircraft, it was thought more likely to occasionally go down.

"The basic principles of stealthy aircraft are fairly well known," Thompson said. "In terms of [the drone's] on-board electronics and information systems, it is fairly routine in combat to require authentication codes to make them hard to unlock."