According to this Newsweek article, most of your Facebook friends aren't your real friends. And, I agree. I once had like 600 FB friends when it was first popular. Now, I have less than 100. I rarely if ever interacted with those FB friends in real life, offline. Rarely. And I felt like they only added me, to bulk up their profile so that they could look good having more than 1500 FB friends. Although, I don't hang on to people's FB profiles to prevent decay of the connection. I've blocked and deleted plenty of "fake FB friends" over time when I realized that they had no interest in a real friendship with me offline. They just wanted to waste my time FB messaging me all day long, or post funny memes on my FB wall for their entertainment. FB is weird. I belong to a bunch of artistic and creative FB groups and follow my favorite bands or other public figures. But I now only have FB friends whom I have hung out with in person. I don't care if people take offense or are hurt when I delete them. If I delete them, they already know the reason why: they had no interest in really being my friend.

Facebook Friends Are Fake Friends, Study Finds