luckily for you nef, the drama seems to cut off once you reach 21 
Not really. My wife does facebook and she's 49.
Its just that once you reach that age its expanded from a small group picking on you to complaints about life and the world in general.
Its short its gone from "he/she's picking on me" to "Everyone is picking on me"
I may put one up for business cause people keep telling me it heps my web presence and is overall good for business.
But on a personal level. I look at it this way. Almost anyone I've wanted to keep in touch with in the last 30+ years. I already do.
Anyone I think I may want to hear from from and havent stayed in touch with. I try to remember why I stopped being in touch with them to begin with and usually remember a pretty good reason.
Anyone I'm currently in touch with... Well, I already am in touch with. So what do I need facebook for? They are only an email or phone call away from anything I care to share with them.
There are a few people. Like less then 10. That I wouldnt mind knowing what ever become of them. But thats about as far as my curiosity takes me.