Snopes claims to be a fact checking site. This is false.
I would trust Snopes to confirm or deny an urban legend. Beyond that, they are wroght with opinions and outright lies. All in all, a terrible fact checking site.
Something that would give them a smidgen of credibility is if people were able to comment on and rate their 'fact-checking,' but unfortunately they don't allow any outside input. It's either their opinion or nothing.