This is extremely unpleasant given the vast reach of US authorities worldwide, let alone just for entry into the US.

Someone could ruin your life based on just your name just by impersonating you or simply having the same name on social networking while acting in some way an authority finds offensive, even if you yourself have never used it!

It would seem you are actually safer to be the first to create closed and private accounts on Twitter, Facebook, Google+, of your actual name - even when you never ever want to give out your private information, including your name, and will never use the accounts.