Zynga has made some of the most popular apps on Facebook, such as FarmVille with its 75M users. With a total of 239 million monthly active users of their apps, Zynga has a significant proportion of Facebook users hooked. But they just about got unhooked: Zynga and Facebook were in a tense face-off over Facebook’s currency and the site’s cut.
Facebook is moving wholly to the Facebook Credits system, with the network taking a 30% of transactions with apps. A new agreement, announced today, has averted the war. The two companies have finally realized that they are interdependent, though I daresay Zynga needs FB a bit more than FB needs Zynga.