SAN FRANCISCO (Reuters) - Zynga Inc raised the lower end of its 2012 earnings outlook after quarterly revenue beat Wall Street's rock-bottom expectations, driving its shares 13 percent higher. As pressure fell on the embattled "FarmVille" creator to show Wednesday that it has stabilized its spiraling business, the company assuaged investors with a series of minor announcements, from a new deal with British firm bwin.party to offer online real-money gambling in the United Kingdom to a $200 million share buyback plan that would lift its dismal share price. ...

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