Find Better Coverage suggests to find sources that are higher quality - more authoritative, more recent, more accurate. You want to know if the claim a source is making is true or false.
You may stop after investigate the source if you aren't satisfied with the information you found. However, you may want to find something closer to the originating source of a piece of information. Questions that may occur to you are 1) "Is this topic accepted by many people?" OR 2) "Is this topic a source of controversy?"
These websites seek to assess websites and topics.
A project of the Annenberg Public Policy Center at the University of Pennsylvania, this site monitors the factual accuracy of what is said by major U.S. political players in the form of TV ads, debates, speeches, interviews, and news releases.
Journalists and researchers from the St. Petersburg Times and Congressional Quarterly (CQ) fact-check the accuracy of speeches, TV ads, interviews and other campaign communications, and post their findings to the PolitiFact website. The site offers a "Truthometer, "a scorecard separating fact from fiction," for analyzing political claims.
One of the oldest fact checking websites. It cover popular culture and other topics.