I have some solutions in regards to the spammers- (please pass this along to the website owner/admins)
Have you thought about restricting new users to one gallery submission per day? You could even award users points for submitting galleries. The more points you have, the higher your level- the higher your level, the more galleries you can submit. For users that have been with imagefap for a long time you can set them at level 5 or something. I don't remember whether signing up requires you to pass a captcha, but that's something to consider as well. And a captcha for submitting a gallery. Captchas make it harder for spambots or scripts to auto-execute the creation of accounts and submissions of galleries.
One other limitation you could consider for new users- the descriptive text at the top. They typically put in "click here, uateens.net" or whatever. If you remove the ability for new users to use descriptive text or links, it should help a bit. This could outright make spammers stop using Imagefap since they wouldn't be able to direct users to their spam links.
As for everyone else, why not remove the spam galleries entirely, so that they don't clutter imagefap? It sucks having to scroll through one whole page of spam to click onto the next page. Or, if hiding the removed galleries isn't viable, why not give users a button to hide removed galleries?