1. A computer implemented method, comprising: identifying one or more signals indicative of potential co-presence of a user with one or more individuals; causing a microphone of a client device of the user to be activated to sense one or more audible sounds in response to identifying the one or more signals; receiving audio information from the client device, the audio information based on the sensing of the one or more audible sounds by the client device; identifying one or more voice profiles, wherein each of the voice profiles is associated with an individual and indicates one or more voice characteristics of the associated individual; determining at least a given voice profile of the one or more voice profiles matches the audio information; determining co-presence of the user with at least the individual associated with the given voice profile based on determining the given voice profile matches the audio information; identifying an action that includes a trigger based on co-presence of the user and the individual associated with the given voice profile; and invoking the action based on the determined co-presence of the user with at least the individual associated with the given voice profile.