UberMedia

For keeping Twitter on its toes. In February 2011, Twitter briefly shut down several of UberMedia’s Twitter dashboards for violating policy before reinstating them days later. Three months later, Twitter shelled out $40 million to acquire TweetDeck in a defensive move to prevent UberMedia, who had made an earlier offer, from controlling 17% of all tweets. But UberMedia’s doing just fine without TweetDeck: Its users generate 12% of all tweets, and in October, it launched Chime.in, a Twitter-esque interests network.