We're one of the community spotlight members, along with a couple hundred other sites. We're not directly, or indirectly for that matter, affiliated with Infopop/Groupee; however I do provide support at http://www.ubbcentral.com
which is where this should be posted.
Your best bet is to upgrade to UBB.Threads7 (liek we did) this halted the majority of the 4-12 daily spambot signups and the majority of postings.
In UBB.Threads 7.1 Rick will be introducing several CAPTCHA options for human identification to help decrease bots as well.