The good: they're really into the FB thing and I'm happy with their responses to the first two informal writings prompts. My concern that late-posters would merely reiterate what early- posters had written has not yet come to pass, which is great. They're communicating with one another (and with me) regularly, which is also great. The one downside to creating all this cyber-community feeling is that we don't really know each other very well (even if it feels like we do) and that becomes apparent when we sit in a room together. I think this will be less of a problem over time, though. It's only week 2, after all.
The not-so-good: computer labs are built for writing on computers, not interacting with fellow students and having discussions. I've therefore dedicated a good chunk of our Mondays to writing in class but a few students have said that they think better at home and would prefer to write there. Now this could be an excuse to get some "help" outside of class but it could also be a legitimate concern. One student is worried that her lack of typing skills will hurt her grade.
Going forward: I'd like to give them access to their grades online (a la Blackboard's Gradebook, but better) but don't know how to do that securely and privately. I'd also like to use FB for peer review exercises but am not sure where to begin.