As general manager of Reddit, the web’s dominant social-news site, Erik Martin oversees a community where tens of millions of members share…well, everything: articles, photos, opinions and advice on just about every topic of interest to human beings. Even the President of the United States participated in 2012, answering questions during one of the site’s “Ask Me Anything” sessions. But Reddit’s almost-anything-goes philosophy has its downsides. In October, Gawker’s Adrian Chen unmasked the man he called the web’s biggest troll: Michael “Violentacrez” Brutsch, a prominent Reddit member who, until the site tightened its policies, was responsible for a bevy of popular content which was at best distasteful and at worst pornographic.