The BBC World Service ("The World's Radio") had a show just the other about spoof and misinformation sites. I guess one of the best-known satirical sites is The Onion though it was not mentioned in the BBC show. And then there are the outright made-up news sites. I'm sure a lot of people believe their lies -- if the number of friends and acquaintances who quote ridiculous stuff is anything to go by.
Kristof goes into the subject in some detail here: lies in the guise of news
The take-away is "buyer beware". Do the common sense test. Also read the MSM. If the crazy sounding thing you just heard or read is not in the MSM then it needs more research.
If it's NOT in the MSM doesn't make it not true: just that it needs verification. Take, for example, the issue of oppression and murder of Christians in the Middle East. It was covered in detail in the blogosphere for years before the MSM got around to acknowledging it. But for other stuff: confirm and verify.
