They always cite their sources and their reasoning, and they're really pretty fussy about not classifying something as true or false unless they have a solid case for it.
Even really textbook, seemingly obvious urban legends don't get labeled false unless they have some pretty solid proof.
I have no doubt that the type of people who spread urban legends are unlikely to actually read the part where they show their work, but it is there.
They have
some sex legends here, and
college ones here, with a Risque Business subcategory.
With a lot of the embarrassing story or current trend urban legends and such, though, it's almost impossible to either confirm or verify them unless you can locate some solid source, which urban legends just don't have.