A "Wait" period of say a week after signing up before you can post
Lets new members look around and read old posts etc to let them see what its all about but they cant post till they are signed up a week....This will cut down on the people who sign up with aliases to abuse escorts (and others) in a thread they created 2 minutes after signing up.
The novelty of trolling will soon reduce if they cant sign up and immediately start a troll thread
(BTW ,I know this is a twist on Samlads initial ask as its not about topics per se)