Systems and methods are provided for determining relationship between users. The systems and methods may include receiving, from a target user terminal and one or more other user terminals, one or more physical addresses associated with one or more wireless signal sources. The system may determine one or more relationships between a target user associated with the target user terminal and one or more other users associated with the one or more other user terminals based on the received one or more physical addresses. The one or more wireless signal sources are within search ranges of the target user terminal and the one or more other user terminals.