A spam bot is a program that can automatically sign up to a forum and create a topic advertising their sponsor's web site. Often their sponsors are porn sites, and the advertising topic will also contain images.
Since spam bots usually can not post into an existing topic, we have implemented a system where newly validated members must post into an existing topic before being allowed to create a new topic.
As an incentive to prove they are not a spam bot, newly validated members can not see any of Tama-Zone except the spam bot filter forum, until they have posted a reply in the topic in there.
Any account more than a few days old which has not posted in the topic in the spam bot filter forum (i.e. and account more than a few days old which as 0 posts) will be assumed to belong to a spam bot, and will be deleted.