It's like Snopes for Twitter, from Columbia U's journalism school.
Emergent presents a list of rumors circulating online and the current best estimate of their veracity.
You can view a list of rumors being tracked on the homepage, along with their current claim state (True, False, Unverified). Click on a story to visit a page that visualizes the sources reporting the rumor, and a breakdown of social shares per source. You can also click on individual articles on the story page to see specific revision and social share data about that article. For more detail about how Emergent works, check out the posts on our blog.