Followers: 1.6 million
Sample tweet: "Help rebuild Japan! 100% of the proceeds from this shirt go to @RedCross Japan relief efforts! http://thrdl.es/~/shD"
The Chicago-based T-shirt retailer crowdsources quirky and unique designs from across the Web. But its Twitter feed manages to be just as hip, serving as both a listing of the latest and greatest and a repository for cool viral content.