@wilbr I don't disagree but I think this is more of a social problem than a technological one. Same with moderation. Assume good faith if not given clear indication otherwise, and be gentle to folks who skipped from AOL directly into Facebook without stopping.
@BalooUriza @kissane the particular brand of snark that Twitter developed is really damaging for sure, few other places have made it quite so ok to be short and mean to each other as, say, a Twitterer enforcing a "boundary" (not actually a boundary, of course, since boundaries are things you do, not things you tell others to do) and that's been partially copy pasted over here too