A mathematical model developed by Princeton researchers John Cannarella and Joshua A. Spechler predicts that Facebook is doomed and will lose 80% of its peak user base between 2015 and 2017.
I don't really see it ending in a while. Perhaps it loses popularity but I think Facebook has become too ingrained in part of our lives to get away from tbh
2016/2017. I think its sad that so many sites are based off Facebook integration when its all gonna come crashing down on them. They better be prepared.