I have one set of parents on my FB(both of them mom and dad) I consider us pretty good friends as well though, we trade kids for the weekends, they've let me use thier tent trailor. Of course things could go bad but I'm way to laid back to worry about that. They know I go out and party, so do they, so not really worried about them being in shock about that. Sometimes I've been out with the kids and end up dropping thiers off and end up going in for a beer, so don't think I'll run into problems there. I wouldn't add any of the other ones though.
I am a chatter though and do have pretty big conversations with a few of my parents. We also attend Birthday parties(well my son does he is old enough to be dropped off). Most of my parents are pretty awesome, things happen and there isn't much you can do about it, so I try not to stress about them screwing me over. Last month I got a 100$ bonus so that was pretty great and I felt appreciated.