Change your password if you do not want to "lose" their identity. It is one of the precautions, which fans of new technologies, social networks in the first place, must take as a habit if you do not want to risk seeing their profile for sale on the Internet.
Web 2.0, in addition to connect millions of people also allows malicious hackers to get into the networks of friends who every day are developed mainly through Facebook.
And once the password and email addresses have been decoded the game is done in a moment he was robbed of accounts and online identities.