I also like it, and am noting that others do too.
I used to be a hater toward FB and the like, but it's actually worked to make things a lot warmer with a lot of people, and I've really enjoyed it.
I see a lot of people still struggling with it, and of course others for whom it's just not interesting. I think more people should step out and try it though. It's social network virginity, and learning to be more open online is nerve-wracking at first, and fires up self-consciousness bigtime, but the outcome has been much more worth it than I expected.
Especially for those of us who've done a fair bit of contracting and city moves for jobs, that's meant a lot of upheaval and loss of friends and closeness, and it takes a long time to replace. I think that gets easier, and less valuable relationships are lost.
Like many of these things, if you are "friends" with lots of idiots, it's not going to be that useful. If you are friends with lots of smart people, you get some really cool stuff sent your way.
Also, you can add more than 140 characters, real links, pictures, etc. You lose some of the public version of SMS feel that Twitter has, but those constraints were becoming more of an annoyance to me.