Who Is Hosting This recently posted an infographic detailing the various steps one would have to take to effectively delete their online identity, from removing profiles on various social media sites, up to deleting any current email addresses. It isn’t definitive (the internet never forgets), but it’ll make you much harder to track down even beyond a cursory search.
www.whoishostingthis.com/blog/2013/12/12/how-to-disappear-online