As upheavals occur on Facebook, some aftershocks have hit games on the social network hard. When third-party notifications were removed in March, 14 of the top 25 games lost active users as a result and in April 18 of the current top 25 experienced a decline.

Zynga was hit hard, with FarmVille losing 4.4 million active users, Cafe World losing 2.6 million, and Mafia Wars 1.4 million, resulting in a total of over 10 million active players gone across all of their titles. Things weren’t all bad for the social games industry leader, however, with Texas HoldEm Poker seeing a slight gain of 100,000 players, new app Treasure Isle quickly rising to 2.2 million MAUs and FarmVille still far and away being the biggest Facebook game app with 78.4 million monthly active users.

Source: Inside Social Games