For the past few months we've been getting spam on our forums every single day. We've got Q&A enabled, plus the excellent "Detect and Block Spam Registrations" and "Tac Anti Spam Collection" addons. Yet spammers still get through. It's normally supplement / drug spam and always contains a link. We've set it up so that posts containing a link are placed into the moderation queue, but it's tiring for the moderators to constantly clear out this list. Are there any other techniques that I'm missing which will help reduce spam on our forums?