Over the past few months, we've crunched countless "Likes" from thousands of users of Trendsetter, our first-of-its-kind platform that ties together polling, social influence data, and consumer preferences. We've used it to map the politics of the social Web, analyzing the political partisanship of the user bases of various social properties. Using predictive modeling of Facebook likes, we tied political preferences and engagement to one's choice of social media, and this bubble graph is the result....
Sites that tend to skew more Republican include those oriented toward commerce and personal finance--like PayPal, eBay, Zillow, and LinkedIn (not to mention Amazon, albeit at lower levels of political engagement). Sites that index higher for political engagement include Quora, BuzzFeed, and Wikipedia, which emphasize information and knowledge. Meanwhile, visual pinboards and social games may be fertile ground for the campaigns to find new voters, as those sites often demonstrate defined political leanings combined with lower levels of political engagement.
Campaign 2012 is a contest between Etsy-shopping, Spotify-listening Tumblr readers, and eBay-shopping, Pandora-listening FarmVille players. As I suspect you may have suspected.