I don't think this is workable. First off, it means that everyone requires a single, authoratative identity on the web, which search engines and content grabbers can reference. Second, there's nothing in it for the search engines/content grabbers. Any service that gives people sweeping power to delete content is at a disadvantage to those who don't. And third, there are plenty of good reasons why you can't lay claim to everything on the web that involves you. Say, for arguments sake, that we're just talking about photos. Suppose I take a great photo and you're in it. Now I upload that photo. My 2015 photo sharing site uses facial recognition, and it appears on your list of personal data. Now what if you don't like my pic? Should the photo sharing site take it down? What if I don't even know you, but you happened to be walking in front of a public landmark on the day you said you were off sick? In fact, what if I'm a photojournalist?