Emergent is a real-time rumor
tracker. http://www.emergent.info/about
It is part of a research project with the Tow Center for Digital
Journalism at Columbia University that focuses on how unverified
information and rumor are reported in the media. It aims to develop
and best practices for debunking misinformation. Kind of like a
"real time" version of Snopes.
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.