Facebook has lost a substantial amount of its game users since altering its notification system, with FarmVille alone recording a dip of 4.4 million players.
Gamasutra first reported the story, noting that 18 of the top 25 Facebook games lost players in April – with 12 of those games losing at least a million users.
MindJolt Games took the biggest losses, dropping almost eight million gamers in all over several titles.
Facebook made the alterations, limiting the amount of user-base expanding notifications applications can send users and their friends, in order to make their titles more “streamlined, clear and less spammy.”

http://www.develop-online.net/news/3...ffer-user-drop