If you haven't seen the petition to stop fat hatred on Facebook on another blog, it's on the sidebar here. Please sign it and help us get Facebook to put a stop to all the groups promoting hate speech against fat women (and men, but they're mainly going after women).
Atchka, of Fierce, Freethinking Fatties, started this campaign. One group has disappeared from FB, but there are over 300 more, and some of those groups have over 100,000 members. That's a lot of hate, folks, and it carries over into the real world. We've all had to deal with the haters in our lives, and I agree with Atchka - it's time to draw a line in the sand and say "This is unacceptable and intolerable and we're not going to take it anymore."
FFF also has some great ideas on Guerrilla Activism (and if you check out that link, you'll find a couple of other posts that have some good ideas, too).