From anonymity, it follows that A and B cannot raise their own statuses by being mean to a 3rd party.
From ephemerality, it follows that anything mean A and B post cannot long endure. Were C & D to post something mean about a 3rd party in the same thread, it would push the mean postings of A & B into /dev/null. Were E & F to post something mean about a 4th party in a new thread, it would push the entire thread about the 3rd party into /dev/null.
