There’s a dark side of communities as well. And that’s insulation. When the reason for community changes from ‘keeping those inside safe’ to ‘keeping those outside, out” we lose perspective, we stagnate, and we stop introducing new ideas. (Not to mention crippling the genetic pool.) We circle the wagons.
Facebook Isn’t a Community, It’s a Company Town
Mike Monteiro

I don’t see what FB is doing as community, but cult. And cults defend themselves by indoctrinating members to treat criticism as “attack” and critics as agents of the devil. Remember that a member of FB’s board thinks cults are the best form of business organization.