PolitiFact

A good starting point for getting information on political and other "news" stories reported in the media, shared via chainmail, or posted by organizations on Facebook and elsewhere. This site provides an interesting "truth-o-meter" feature to rate the veracity of stories and claims made by politicians. More concretely, it also supplies the context that "soundbites" used to sway opinion are taken from.

Snopes

A long established source for checking on stories and claims made on the Internet. Some people claim Snopes has its own agenda when it comes to how it analyzes stories. As with all fact-checking sites, use Snopes as a tool to do your own research rather than merely relying on the conclusions you find there.

TruthOrFiction.com