I suspect quite a few "adults" on FB are affected by the same malady.
I think you are right. I know some people who get all excited and say stuff like, "OMG, I have 500 friends!" No you don't, you just have mostly strangers who have visited your site. It's kind of embarrassing, actually. I've never joined Facebook or any of those sites and can't see it happening anytime soon.
Note: I'm sure there are positive features of these sites, but this article is about the negative ones.
They are. We had to block Facebook here at work.
As an aside, an employee here "friended" her boss. One morning, after a particularly hard night of "OMG. I. Just. went. to. the. most. AWESOME. party." nonsense, she posted her status as "sleeping".
Her boss, receiving the update, was curious and wandered over to party girl's cube. Sure enough, her status was accurate. Now, she's a former employee.