Abstract: A method and system which shows a user contacts that are nearby but protects those contacts' privacy by mixing indistinguishably into the list contacts that are not nearby thus creating an obfuscated list such that user is unable to identify which contacts are nearby and which are not nearby. The user selects contacts the user would want to see if they were nearby. If the user selects a contact who is actually nearby, the system then protects the user's privacy by presenting another obfuscated list to the selected contact. The system discloses proximity only after two users have each mutually selected each other. The system may more broadly be used by showing the user contacts that have any form of matching personal data while still protecting all users' privacy with obfuscated lists until two users have each mutually selected each other.