I just used it on the demo board and it works perfectly.
Just a few questions (i'm not sure if they've been answered because I'm not about to read 11 pages to see), but:
1) What all does this MOD send to Facebook as notifications (I read that it was implemented with notifications, but didn't see what it sent) For instance, can you set it up to send you a facebook notification if you get a new PM and a link to the PM inbox from the notification?
2) Connected to the last one, seeing as phpBB shows when you're online or not in viewtopic, if you're online on facebook, does it show you also online on the phpBB board? Here's my reasoning: if you get notification of new PMs and/or new posts made to subscribed topics, and you see them in real time, it should show you as online on phpBB as well.
Of course #2 isn't critical or anything; just wondering.
I'll definitely keep an eye on this so that when it comes out I'll be able to use it on my board. Great work so far, and keep it up!