Just came across this website and I think you should know about it. People can decide to go anonymous for different reasons and you cant completely be anonymous when your data is flying in social media websites. 

Thats what this website helps you to get rid of. Account killer does one simple thing for you, it helps you to search the major social media websites and provide you with instructions on how you can get your data off their database. 

Account Killer

Do you care about your personal data? This website provides instructions to remove your account or public profile on most popular websites, including Skype, Facebook, Windows Live, Hotmail / Live, Twitter, MSN / Messenger, Google and many more.