I use it, and I make occasional status updates, but I don't do those stupid "I:: Am at work. Work is boring!" or anything like that. I make normal comments like a would here, except they begin with my name.
I enjoy it, too, mostly for Mafia Wars. I just find it fun, even though it's incredibly simple. I can enjoy it because my friends make funny comments, as well as games, but mostly for Mafia Wars.
No Farmville, surprisingly. Always hated Farmville.
And I never add random people. If I don't know you, I won't add you.