Proximity-Based Trust

In one embodiment, a method includes detecting a triggering event to initiate a communication session with a second computing device associated with a second user, where the first computing device includes one or more wireless transceivers and one or more sensors, determining an initial trust score for the second computing device, sensing physical interactions between users using the one or more sensors, adjusting the trust score for the second computing device based at least on the sensed physical interactions, and sending a message to the second computing device if the adjusted trust score for the second computing device satisfies a first threshold.