These so-called (in the normal use of that phrase, not the Singapore misuse / overuse of "so-called") Social Networks are really an oxymoron.
They are anti-social by virtue of the fact that some users of them, including apparently yourself, value online interactions over face-to-face relationships with people.
If you have real memories of experiences together, some of those are probably with friends; if the only evidence of friendship you have is text, well in most cases that's just not enough to warrant calling someone a friend.
Nobody has 600 friends. Only you know which of them are your real friends, the vast majority of the rest are acquaintances. And very likely a few are not even friends at all.
Know the difference.
