I was watching an old episode of Seinfeld the other day (it was "The Pool Guy" episode), and I couldn't help but LOL when George went off on Jerry for introducing Elaine to his girlfriend Susan. If you haven't seen the episode, George gets mad because he doesn't want his "worlds colliding". . . meaning that if his relationship self meets his independent self, it will be the end of independent George (you can check out the clip below).
Anyway, this got me thinking about social networking sites like Facebook, where many people keep their work contacts separated from their friends and therefore, decrease the chances of their "worlds colliding." What do you think about this? Do you keep some sort of separation among your various worlds?