US Patent 10554592 Collective address book system

Methods, systems, and apparatus, including computer programs encoded on computer storage media, for a collective address book system. One of the methods includes: receiving a request from a user to contact a person of interest; determining that contact information for the person of interest is not available in the user's contact information to which the system has access; determining that the collective address book system has access to contact information for the person of interest; generating proxy contact data for the person of interest; and providing the proxy contact data to the first user.