Anonymous - who is he?

Question: On a console game where two people are in a XBOX party, they come into a game lobby (session) where another is invited to join them. The guy who invited the guy to the lobby said hello. The invited guy starts saying rude and vulgar things to the guy who invited him to the session (we'll call him Guy #1). Then Guy #1 stopped speaking after merely saying "sorry." Then the other guy (Guy #2) in the party greets the invited guy by using his name, then preceded to tell him his location, his suburb, and his exact home address. The invited guy freaks out. Then Guy #2 threatens him by spreading his personal information to all computers across the nation. How does Guy #2 know all of this personal info?

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