The Twitter Porn Name meme is a sneaky way of getting Twitter users to voluntarily give up answers to common security questions:
The current game has a few variations but the information it illicit is all the same. To find your "porn name" you are asked to take the name of your first pet, combine it with the street you grew up on or your mother’s maiden name. Yep, all of these are common security questions to access your online accounts and bank information.
More social networking → more social engineering.