enemies? Seriously? This is the innernet with avatars and people typing on keyboards, if you have enemies online then there is something wrong with the world. The reason being so called enemies can be eliminated with one click on ignore person tab.
My motto in life is don't type something to someone if you don't intend to say it to their face. It's a small world, life is short and I don't have time to worry about petty things like enemies.