+When someone asks to join, they must include an email address and they may provide a reason that they want to join. If they provide a reason that's not gibberish, we accept them. If they don't, we search Google for their email address. If there are good results (often from a university or company), we accept. If nothing suitable turns up, we email the applicant and explain that everyone is welcome but we filter for spammers. We usually get a reply and then click "Accept". (If they don't reply, then we don't accept them in the group.)
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