| http://www.w3.org/ns/prov#value | - k's games, reports Bloomberg.The marketing strategy that Zynga implementated left some users unhappy and has increased the distance between Facebook and Zynga.The Facebook Developer Day at Game Developers Conference 2013 announced that its games are a now $2 billion business with more than 100 developers generating more than $1 million each from the company last year.Facebook's director of game pa
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