Even if a service existed that would manage your online identity, how would you prove at you are yourself everytime you sign in? I think thats the biggest probl

Even if a service existed that would manage your online identity, how would you prove at you are yourself everytime you sign in? I think thats the biggest problem right now. Another problem is the second someone gains access to your 'online identity' they now have access to everything else that was also linked using this identity. So maybe its not a good idea to have a central identity manager. Maybe we just need to be researching how do we prove that you are indeed YOU when you visit a site again and not worry about figuring out if you are you AND the same person on x,y,z sites.