NO slander of Islam. Discussions, yes. Slander, no.
NO qabiil slander. Discussions, yes. ( i.e Did *** qabiil have great poets? Which qabiil occupies most of *** Province, etc) Slander, no. (i.e *** Girls are slutty. **** Clan are camelfockers, etc.)
I'm sure i'll think of a few more. But other than the above, most anything should go, imo.