Download a pdf version of this poster HERE. There's an interesting site where you can read an online book titled Web Literacy for Student Fact-Checkers...and other people who care about facts. The book covers a wide range of techniques and tips for fact checking things you read on the web to determine if they are accurate. There is also a table of contents that outlines the topics included in each chapter. The “book” does contain spelling errors, but it's still worth a read.
The site also recommends the following organizations are generally regarded as reputable fact-checking organizations focused on U.S. national news:
Politifact - rates the accuracy of claims by elected officials and others on its Truth-O-Meter.
Factcheck- A project of the Annenberg Public Policy Center of the University of Pennsylvania
Snopes - reference source for urban legends, folklore, myths, rumors, and misinformation.
National Public Radio Fact-Check - The mission of NPR is to work in partnership with Member Stations to create a more informed public.
Hoax Slayer - dedicated to critically analyzing the veracity of urban legends. While it is best known for debunking false stories, it also hosts a page listing strange but true urban legends