Hello, 4-ch! I want to hear your troubles! Post what you're worried about.

Feel free to ridicule other posts. We're all just bored, spoiled souls.

>>84
Then try to divert the other's attention from the troublemaker, or at least from giving attention to the troublemaker directly.
Silly example, but remember how the people at a-ch dealt with Sakurai as he tried to pass himself of as Densha? They ignored him and then, as he was persistent, talked about him as if he wasn't present, then moved on to a new topic.
The best way to avoid trouble (if you are not a moderator or an admin) online is really to ignore the troublemakers or move the attention away from them because all they usually want is attention and outrage.
If that doesn't help you can still contact a moderator/admin about it (personally is sometimes better than publically in this regard).

Of course, sometimes the troublemakers will give themselves attention, even if it's just one single person, thus luring others into participating ("reverse meta-trolling": http://4-ch.net/net/kareha.pl/1112960050/70-73)

Because of this type of problems, some anonymous board software have the ability to reveal a poster's IP (in all of his posts) if he makes too many posts in a certain timeframe (as evidenced here: http://cerealandmilk.net/iichan/img/res/543.html#1022), but I don't think Kareha or Wakaba have this feature (yet).