TOKYO (Reuters) - Markets recovered some ground on Monday after heavy losses last week, but investors remained wary about the euro zone despite world leaders calling for Greece to stay in the monetary union and for Europe to balance austerity with growth. G8 leaders meeting at the weekend vowed to take all necessary steps to combat financial turmoil and revitalize a global economy increasingly threatened by Europe's debt crisis, but they offered no specific prescription for debt-crippled Greece which holds fresh elections next month. ...

Twenty-two states and the District of Columbia are backing Montana in its fight to prevent the U.S. Supreme Court's 2010 Citizens United decision from being used to strike down state laws restricting corporate campaign spending.

NEW YORK (Reuters) - Newly issued shares in Facebook Inc may have a hard time in the coming week if lead underwriter Morgan Stanley stops supporting the stock and managers lower down in the IPO book who were hoping for an early surge decide to get out before going underwater. Facebook on Friday sold 421 million shares of stock in a deal that valued the company at more than $100 billion. But investors, expecting a first-day pop in price, instead saw it close just 0.6 percent above the IPO price at $38.23. ...

On paper at least, European leaders agree: They need stronger growth measures to help their economies expand out of their 2½-year-old government debt crisis. Figuring out exactly what those new steps might be will be the hard part.

SAN FRANCISCO (Reuters) - The chief executives of Apple Inc and Samsung Electronics Co Ltd are used to running the show at their global tech empires, but they will be in for a different experience when they arrive at a San Francisco federal courthouse on Monday. Apple's Tim Cook and Samsung's Choi Gee-sung, whose companies are embroiled in bitter patent litigation, have been instructed by a federal judge to appear for court-supervised mediation. A joint court filing in April said that "as directed by the Court, Apple and Samsung are both willing to participate" in the discussions. ...

"The Avengers" continues to muscle out everything else Hollywood throws at it, easily sinking naval rival "Battleship" and other new releases.

Facebook begins selling stock to the public Friday in the most talked-about market debut in years. Two Associated Press business writers are debating whether the stock is a smart buy.

When Dan Fitzsimmons looks across the Susquehanna River and sees the flares of Pennsylvania gas wells, he thinks bitterly of the riches beneath his own land locked up by the heated debate that has kept hydraulic fracturing, or fracking, out of New York.

(Reuters) - Shares in social media company Facebook Inc could fall below the initial public offering price of $38, Barron's wrote in its May 21 edition. Facebook saw its shares rise a scant 0.6 percent to $38.23 on Friday in the first day of trading. The stock stayed above the $38 IPO price, supported in the market by the deal's underwriters. But Barron's said the "big question" this week will be whether they continue to do so. ...

NEW YORK (Reuters) - Normally a big decline would set up Wall Street for a technical rebound. But that may not be the case this week, even after the market posted its worst weekly loss for the year and the S&P fell for six straight sessions. With the corporate earnings season drawing to an end and recent U.S. economic data raising doubts about the pace of growth, the S&P 500, which is down 7.3 percent so far in May, could decline further this week as concerns about the financial health of Europe persist. ...

SEOUL (Reuters) - Samsung Electronics' mobile division chief JK Shin said on Sunday the South Korean technology giant was still seeking to resolve differences in its international patent war with Apple Inc.. "There is still a big gap in the patent war with Apple but we still have several negotiation options including cross-licensing," Shin told reporters at Seoul airport shortly before his departure for the United States. Asked about the prospects for Samsung's memory chip business, Shin said the 4G chip shortage was expected to continue until early in the fourth quarter of this year. ...

For Facebook founder and CEO Mark Zuckerberg, it was quite a week — from birthday, to IPO, to I DO.

(Reuters) - Facebook co-founder and CEO Mark Zuckerberg wed longtime girlfriend Priscilla Chan on Saturday, announcing the nuptials through a status update on the social networking site. The 28-year-old billionaire's wedding took place a day after Facebook's initial public offering on the Nasdaq stock exchange on Friday. More than 280,000 people "liked" Zuckerberg's status change, which was accompanied by a photo of the smiling couple in wedding attire in a small, verdant outdoor setting with a string of lights behind them. ...

(Reuters) - Google said on Saturday that Chinese authorities have approved its $12.5 billion purchase of Motorola Mobility Holdings, the last regulatory hurdle to a deal that would allow the world's No. 1 Internet search engine to develop its own line of smart phones. Google, which will be the newest entrant to the handset market, announced plans for the acquisition last year in a bid to secure Motorola's valuable patents and pave the way for a pairing of Google's Android mobile software and Motorola's handset business. U.S. ...

WASHINGTON (Reuters) - Europe's second largest lender Russia's Sberbank will see some certainty over the planned privatization sale after the new Russian government's lineup is announced on May 21, CEO German Gref said on Saturday. Sberbank initially planned the sale of the 7.6 percent stake, part of Russia's ambitious privatization program, last September but postponed the deal after global risk aversion wiped around $1.5 billion off the stake's value. "It seems to me that, yes, such certainty should emerge (after the cabinet announcement)," Gref said. ...

(Reuters) - Google said on Saturday that Chinese authorities have approved its $12.5 billion purchase of Motorola Mobility Holdings, the last regulatory hurdle to a deal that would allow the world's No. 1 Internet search engine to develop its own line of smart phones. Google, which will be the newest entrant to the handset market, announced plans for the acquisition last year in a bid to secure Motorola's valuable patents and pave the way for a pairing of Google's Android mobile software and Motorola's handset business. U.S. ...