My 3 cents: if I were a moderator here (which you couldn't pay me to do), I'd set 2 simple rules and enforce them strictly and no fuss.
1. Try like the blazes to keep certain individuals from sneaking (back) in, eg that sergey (fill in your own expletive) from the facebook group.
2. Zero Ad Hominem in discussion
Directly or indirectly, one warning with explanation, then out.
100% 'Ad circulum', as it were.
Simple. :-)
Mark
