Hi David,
Anything like SMF forums are particularly vulnerable ... open source software so the idiots get to experiment on how best to mess with them! I've pretty much given up on one we tried to use for our websites after removing a few thousand russion addresses & even more bogus posts. Next incarnation it will be Members Only, invite only, no publicly accessible sign up form.
Anyway, I've added an extra page to the SGP JV signup with a simple challenge question and that's stopped them for now. I guess I'll add a captcha later if required ... and repeat the process when we open for Members.
With the apostrophes ... not a problem on most of the forms, so I thought maybe there's just a line or two of handling missing from some of the form handlers?
Cheers
Matt