Focus on US Politics including topics such as: science, health care, facebook postings, and political talking points. A project of the Annenberg Public Policy Center of the University of Pennsylvania.
PolitiFact checks claims by elected officials, candidates, leaders of political parties and political activists. Pulitzer Prize winner. Ranks statements from True to Pants on Fire.
The oldest and largest fact-checking site on the Internet. Investigates urban legends, claims found on social media and the web, political claims, click-bait, and poplar news stories.
This independent, nonprofit newsroom has won several Pulitzer Prizes, including the 2016 Prize for Explanatory Reporting. ProPublica produces investigative journalism in the public interest.
Although the Washington Post has a left-center bias, its checks are excellent and sourced. The bias shows up because they fact check conservative claims more than liberal ones
From Harvard's Nieman Lab, a weekly roundup of the "growing stream of reporting on and data about fake news, misinformation, partisan content, and news literacy.