Launched in 2005, the social news site Reddit has become one of the most peculiar, powerful, and even controversial destinations on the Web. With 42 million unique visitors a month and some 10,000 communities, the site has worked its way into Web culture—even attracting President Obama, who submitted to reader questions in an AMA (“Ask Me Anything”) session in August. Recently, too, the site has come under heavy scrutiny for its darker side, which includes smaller communities ordered around offensive and sometimes sexually depraved subjects. For its next phase, Reddit and co-founder Alexis Ohanian are looking to the high road, turning to activism and the fight to preserve an open Internet in the real world. Last week, Adweek tagged along as Reddit set out on its Internet 2012 bus tour. Here’s what we saw.