| http://www.w3.org/ns/prov#value | - Zuckerberg will get a chance to muse about Facebook's fall on Tuesday when he is scheduled to speak at a technology conference in San Francisco.Zynga Inc., the maker of FarmVille, ''Mafia Wars" and other games that first became popular on Facebook, appears to face more uncertainty.The San Francisco company is losing money and players while facing stiff competition as more games are played on mob
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