The uncertain times after the Sept. 11 terrorist attacks have given rise to all sorts of rumors. E-mails have circulated about malls that will be attacked on Halloween, about Osama bin Laden being spotted in Utah and Oliver North having warned about bin Laden at the Iran-Contra hearings in 1987. None of these turned out to be true and quickly were debunked on Internet sites devoted to "urban legends." The most prominent of these is Snopes.com, a Website started in 1995 as a hobby by David and Barbara Mikkelson, respectively a Web programmer and housewife in the Los Angeles area....