The unofficial queen of the cybervigilantes is Janice Shell, a 50-year-old art historian who lives in Milan and got hooked on busting online con men after she was burned in an Internet investment scheme two years ago. A tireless--even obsessive--pursuer of online malefactors, Shell says she spends 12 hours a day trolling the Internet, looking for crooks. Thanks to this single-minded dedication, she has become a celebrity--at least to those who hang out on Silicon Investor. There are two threads devoted just to her: "Janice Shell for President" and "Janice Shell--A Retrospective."