Adbots. We have all seen them around. They weren't too much of a problem, but now they seem to be everywhere, multiplying like...ehh...adbots? I understand that we can do nothing to prevent them, but I'm sure that we could hinder them. Please post your ideas on how to cut down on the adbot-attacks we've been recently having.
My idea is that we put a limit on how many links you can post. This limit would be related to your post count. Maybe so that when you start out, you can only post 3 links per post. After your 50th-100th post, this restriction would be lifted. Alternatively, instead of having the restriction removed all at once, maybe every 25 posts or so you'd be able to post one link more.
Other's Ideas:
-IP Ban all offenders until there's none left (multiple people)
-a simple question at the registration form: are you a human? The default answer of it is no, so you have to change it to yes (markus)
-add email validation (botmaster)

