I realized a few years ago that keeping all my completely different social behaviors separated was impossible, because Facebook is so universal now and everyone got on it.
Now my Facebook wall is basically my family and old friends leaving random messages, my gaming friends leaving racist, derogatory, profane messages, and my school friends posting pictures of me doing god knows what. If any of them don't like what I think, write, or do, they can defriend me or fuck off. Works simple enough.
My one rule is never friend anyone at a job I am currently working at. I often friend ex-colleagues but that's it, I never break the Facebook friend with current co-worker rule.

Logged
Pour the wine, hold the grind, quarter to nine, let's go.