Twitter: nearly a million users, and no spam or trolls. Think about any other online community system ever created – from Usenet to The WELL, IRC to Slashdot to Digg. All of them have had to deal with the core problem of idiots on the Internet. Slashdot’s extended karma system, or IRCs multiple moderation commands, Digg’s diggs, etc. are all about filtering out the assholes. It’s a fact – anytime a virtual group gets to a certain size, the morons come and start doing their best to disrupt, defraud or degrade the audience. Twitter, however, has almost a million members, a thriving community, lots of discussions and yet doesn’t have spam or troll issues. If you step back for a second and think about it, that’s pretty amazing.