Just read this over on Lifehacker:
Security Alert: Twitter Porn Names Scam
You've probably heard of or played the "porn name" game before: Take the name of your first pet and the street you grew up, put them together, and that's the name you'd use if you worked in porn. Turns out if you do it publicly on the web, it's a great way for phishers to learn the answers to your password challenge questions. [PC World]
The porn names game has a few variations, but the information that all of the versions elicit is the same. To find your "porn name" you are asked to take the name of your first pet, and combine it with the street you grew up on or your mother's maiden name. Silly, sure. But look more closely: All of these are common security questions. By playing the game, you could be revealing private information that Web scoundrels could potentially use to access your online accounts and bank information.
Be wary of this and similar games that might entice you to reveal potential answers to your security questions. Be sure to pass along the information to your friends if they have unwittingly provided answers to their security questions.