I've been having some hassle with board spam, both from spambots that autoregister than leave spam posts, and with general silliness from those who have nothing better to do and whose personal lives are apparently so bereft that they find it amusing to be annoying on boards. I have therefore switched on two screening elements -- one is that new members will need to do one of those visual confirmations by entering a code they will be shown -- this screens out spambots and is very easy, it just takes a few extra seconds. And second, people need to confirm their registration -- they'll be sent an email to do this. If that isn't effective enough, I'll have to give registration approval before I'll activate an account -- a slight bit of hassle but I hope not too much. But makes it easier to track where the problem makers are and file a complaint with their ISP.