Problems with bogus users

[Big Al]

Not all spamming posts are from bots. So blocking IP's can be of use.

Some spammers will post ten times and then post a link. They can usually be spotted as they post inconsequential things like , "good post, I have been looking for posts like this" and "Nice post I will add to my blog" ETC.

On some sites a noob has to post five or ten posts before they can post a link, so some spammers will post ten times and then hit you with a link.

Rapid deletion of their posts is somewhat of a deterrent to them, as their sole reason for existence is to promote their site's, hence the links, so that they can get income from people clicking them.

If you take this away from them their work has been in vain.