In order to become a member, each applicant answers a series of questions about themselves and their experience, and maybe a few technical questions.
Their responses are posted in a unique thread on a sub forum, where there is a vote by the existing members to determine if they should be allowed to join. Quite what the requirement is depends on how strict we want to be...
Could be % yes votes, or 10,20,30 yes votes without a no.
It then should be compulsory as a member to cast at least x votes per month.
Then maybe after acceptance they are on probation for three months, where one or more complaints gets them kicked.