[Velocd]

Some people will find no use to this, others will. If you know there is a group of people visiting your forums whom you dislike, and they are mainly finding it through google, you could do some undercover work to find the keywords they are using, and then ban those words.

I wouldn't call it paranoid when what you're trying to do is stop 5 spammers a day from joining your forum whom usually range from the age 9-15. It's annoying work for the moderators having to move threads to the right location/close them all the time, as well the members who follow the rules.