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"53% of Facebook users play social games. Since Facebook's IPO filing earlier this year, we know that game-maker Zynga accounts for a full 12% of the social network\u2019s revenue. The ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/insider/2012/03/25/what-happens-when-professional-gambling-meets-social-gaming/petvegas1-2/>