You can make yourself “disappear” from the World Wide Web. But be forewarned: Most of the following tactics are irreversible. This includes losing any marketing presence you’ve built up over the years that can bring you business, and it can also result in being unable to restart an eliminated account with the same name or e-mail address.
http://robertsiciliano.com/blog/2013/11/28/6-ways-to-erase-your-digital-life/