Abstract: The disclosure includes a system and method for summarizing social interactions between users.

Abstract: The disclosure includes a system and method for detecting proximity between users. The system includes a processor and a memory storing instructions that when executed cause the system to: determine a context associated with a first user device; query other user devices based on the context to create a set of other user devices that satisfy a query; generate a list of filtered devices by filtering the set of other user devices; notify the first user device of the list of filtered devices; and query for the list of filtered devices to determine which filtered devices are within proximity to the first user device.

Abstract: The disclosure includes a system and method for detecting fine grain copresence between users. The system includes a processor and a memory storing instructions that when executed cause the system to: process one or more signals to determine coarse grain location information of a first device and a second device; determine whether the first device and the second device are copresent based on the coarse grain location information; in response to determining that the first device and the second device are copresent based on the coarse grain location information, transmit a signal to the second device to alert the second device to listen for a fine grain copresence token from the first device; and refine copresence based on receiving an indication that the second device has received the fine grain copresence token.