Linden Lab Official:Someone in Second Life is providing information about another Resident's "real world" life.

Nobody in Second Life may distribute any information about another Resident's "real world" life. You cannot reveal someone's real-world location ("Bob Avatar lives in Canada"), gender ("Bob Avatar is really a woman"), religion, appearance, age, marital status, race, sexual preference, etc. You may not use notecards, textures, chat, IM, forums, or any other means of violating privacy. Linden Lab will attempt to delete such privacy-violating content, if possible, and will apply appropriate discipline.

There are exceptions:

• Information about a Resident contained in the Resident's own profile may be discussed and passed around
• Information that is patently false may be "revealed" ("Bob Avatar lives on Mars")
• Information provided outside of systems controlled by Linden Lab isn't covered by the Terms of Service ("Someone's posting Bob Avatar's address and photograph on their web page")