The facebook integration is worth 0 to me. I want to collaborate on text, not accidentally click my avatar and be taken to my profile page.

I think the facebook integration is a waste of your development time. If you keep it, keep it only for the easy population of pic+email+username. Also, get rid of login if the pad is truly open to everyone. I'll keep using one of those other etherpad instances, since there's not much facebook integration gives me over a stock instance.

Apologies if I was a bit harsh.