Whenever there's a forum, there are three kinds of trolls:
1. automated spambots selling viagra
2. abusers(page wideners, goatse, etc)
3. n00bs who won't search for answers first
#1 is solved by captchas
#2 is solved by not allowing html tags and breaking down long words
For #3... How do we force new users to search for answers before
creating a duplicate thread on issues that has been addressed already?
In many forums, new members are not allowed to post for x amount of
days.