While it is important to independently investigate information on the Internet, Snopes is considered a relatively accurate website. Snopes is devoted to investigating and either validating or debunking incredible claims, stories and urban legends from around the Internet.
The creators of Snopes maintain that the validity of the information on the website is kept in check by the very people who visit the site, who are typically investigating whether or not things are real. If the information on the site is found to be inaccurate, steps are taken immediately to rectify the situation.
The kind of people attracted to an investigative website that encourages critical thinking and evaluation are the same types who would quickly point out inconsistencies in the information, and therefore provide clarification and correction whenever possible.