How will it "magically" update a contacts information if that contact is not also a user of the service? Also, will you be able to change a contact's name or wi

How will it "magically" update a contacts information if that contact is not also a user of the service? Also, will you be able to change a contact's name or will it only be what their "profile" is? (ie. changing "John Smith" to "John Smith YC09") Otherwise sounds amazing.