Public Relations: Final one.

Pie fights.
Pie fights are characterized by heated, emotional exchanges, and although they are typically of short duration, they can have a devastating effect on an online community. Pie fights can be started by Internet trolls who use baiting techniques to enrage Internet forum users so much that they post inappropriate and/or offensive messages. Unfortunately, this often results in disruption of the forum more than anything else.

Insult.
Insult - http://en.wikipedia.org/wiki/Insult

Holy wars.
It is senseless discussion on the thread when the members are trying to prove to each other something which is not fully related to the topic of the thread.
Action: banning participants.

Posted via web from newdigital's posterous