It sounds like spam bots to me. There's not really much you can do except keep banning IP ranges and email accounts. We have to do it regularly here to keep the forums clean. They work by putting up a link on a forum so the Google bots will pick it up and the site will show up in Google searches. It's all done automatically through software. We had a lot of them all claiming to be from 90210 (or other similar zip codes), then ones claiming to be a doctor. Most have an ICQ number and Albanian as the language in their profiles. Watch out for ones that have MSN or Yahoo as their URL as well.
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