My classes' facebook page is up and running. I have 5 likes so far...2 of which are parents of my students. I think that's great because then they can remind their kids of what's going on based on the facebook page, also.
Here are screenshots from it (not much going on as you can see):
I used wordle to create my cover photo (using this blog).
Well, gots to go...off to grade diagnostic tests. :-\