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Chris Pirillo, the tech pundit and conference organizer, doesn't mind being exposed. But he does object to people stealing his identity, as some unknown user has done on Pownce, Kevin Rose's file-sharing service. Pirillo says he hasn't signed up on Pownce, and doesn't know who's using the username "chrispirillo" on the service. Among the people the faux Pirillo appears to have taken in, if you can trust any username on Pownce: Digg cofounder Jay Adelson, spokesblogger Robert Scoble, and Internet-TV personality Veronica Belmont. One thing Pirillo might want to look into: Someone has also signed up for Pownce with the login "lockergnome," the name of Pirillo's popular tech website.