Username is a must-read for every person who has a credit card or uses the Internet. Who's using your name? Your username? You may not know until it's too late. See yourself as a mark through the eyes of Maureen and Jennifer, master identity thieves. Their scams will shock you as you realize how vulnerable you are. Then there is the nice gentleman you could meet in a chat room, or perhaps he sends you a persuasive e-mail. He couldn't possibly be a serial killer... could he?