User presence detection and event discovery

A computing device, comprising:

• one or more processors;
• and
• at least one module operable by the one or more processors to:
• receive a first group of indications associated with a first group of modalities and a second group of indications associated with a second group of modalities, wherein the first group of indications is associated with a first remote computing device and the second group of indications is associated with a second remote computing device, and wherein the first and second groups of modalities are usable to determine whether a first user associated with the first remote computing device is within a physical presence of a second user associated with the second remote computing device;
• determine a confidence value for at least one modality of the first or second groups of modalities based at least in part on an indication associated with the at least one modality, the indication being from the first or second group of indications, wherein the confidence value indicates a likelihood that the first user associated with the first remote computing device is within a physical presence of the second user associated with the second remote computing device;
• and
• upon determining that the confidence value is greater than a boundary value, determine at least one event based at least in part on a temporal identifier associated with an indication received from at least the first or second remote computing device.

A computer-readable storage device encoded with instructions that, when executed, cause one or more processors of a first remote computing device to perform operations comprising:

• determining a group of indications associated with a group of modalities, wherein the group of modalities is associated with the first remote computing device, and wherein the group of modalities is usable to determine whether a first user associated with the first remote computing device is within a physical presence of a second user associated with the second remote computing device;
• sending the group of indications associated with the group of modalities to a server device to determine whether the first user associated with the first remote computing device is within a physical presence of the second user associated with the second remote computing device based at least in part on a confidence value for at least one modality of the group of modalities, wherein the confidence value is based at least in part on an indication included in the group of indications;
• and
• receiving a message from the server device that indicates whether the first user associated with the first remote computing device is within a physical presence of the second user associated with the second remote computing device.