Originally Posted by wierdo

One thing, wrong section, although it's not my place to mention it.

Second, isn't there a badword filter? Couldn't you figure out what words they are using to link to the pictures and block them?

Third, there should be a username ban tool you can use.

Fourth, if that doesn't work, and they're guests, turn guest posting off. My old forum gets bunches of spam, so I go in and delete it. I need to turn guest posting off too I guess...

Fifth, enable the admin approval of all members if the above doesn't work.

Hope it helps.