This can be handled by 301 redirect or it can be built into the protocol. When moving a profile from one provider to another, the standard could require a respo

This can be handled by 301 redirect or it can be built into the protocol. When moving a profile from one provider to another, the standard could require a response indicating the location of the profile for a minimum period of time (such as a week or a month). A standard such as this would be crawled on a frequent basis by the social network apps built on top of it, as well as the search engines. They would all update their canonical profile addresses and that would be that--an organic, self repairing network.