SAN FRANCISCO (Reuters) - Zynga Inc laid off 5 percent of its full-time workforce and shut its Boston office on Tuesday as it embarked on a sweeping cost-cutting campaign that may eventually see the "FarmVille" game creator close its Japanese and British studios as well. The company, which is trying to arrest a steep decline in earnings as users gradually migrate onto mobile devices or rival games, plans to "sunset" 13 unspecified older titles, Chief Executive Mark Pincus said in a staff memo on Tuesday that was published on the company blog. ...

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