I originally posted this inb the Reedham Ferry thread but I reckon it could do with repeating here:
I see a lot of posts blaming Facebook but the fact is that Facebook groups are moderated by the founder of the group and whoever (s)he appoints. Sanctions range from deleting posts, muting members, deleting them from the group and finally banning them.
What is important, it seems to me, is the Facebook needs to be moderated to the same standard as the forum for continuity.