User blog comment:TheBlazingEye/Facebook!/@comment-26495590-20160107164109/@comment-25543325-20160108111101

According to quite believable source which is Wikipedia, there's a limit of people you can keep enough information to keep track of how they're related to each other, remember most important of their personality traits as well as distinguish them from one another.

This limit is approximately 150 and while it would be possible to exceed it (Maybe even to the point you've mentioned), altough it would require a special method of memory training and more "basic" view on your friends. I'm trying to say that, yes, while you could remember more people, you would know less things 'bout them and probably loose track on who's who.

It's called the Dunbar's Number