Twitter Trails
This group is a product of Wellesley College and a grant from the National Science Foundation. It tasks itself with investigating rumors and other claims on Twitter for validity, measuring both the spread of the claim (how many people have read it) and its validity. The site also offers blogs for meta-analysis of the misinformation on Twitter it investigates.
The Computational Propaganda Project
Since 2012, they have been investigating the use of algorithms, automation, and computational propaganda in public life. Political bots are manipulating public opinion over major social networking applications. This project enables a new team of social and information scientists to investigate the impact of automated scripts, commonly called bots, on social media. They study both the bot scripts and the people making such bots, and then work with computer scientists to improve the ways they catch and stop such bots.
Hoaxy
Hoaxy is a tool that visualizes the spread of articles online. Articles can be found on Twitter, or in a corpus of claims and related fact checking.
(Copied from website)
Claim Buster
Claim Buster allows for fact checking of individual personal claims or claims by public officials. Users can insert their own claims or links to claims said publically to find out their factuality.
(Independently written)