Right, we are very aware of the different troll phenomena. (My friend and I once made a sketch swap site, and I think from the 100,000 sketches submitted in the first week that we saw in the moderation queue, we could have started a 10 square kilometer museum of... uhm, you know what ).
We have an inner ring/ outer ring concept with upranking to get to inner and a vote and flagging system and so on. But these aren't the true core -- what will be crucial is that the good community, meaning all of us, and their combined watching and voting power, will outweigh the less positive people (or convince them to join the fun of creating good stuff). Everyone right now who's in the world and doing good, and chatting and guiding and building, is already making a HUGE difference (as we're admittedly a super small group right now). In fact, we hope that part of the Boing Boing crowd will give it a try and join too as we love this blog and the people that might read it, and we need every good manyzen in the world now