A human behavior influencer having a database, a proximity detector, and an interaction controller is provided. The database stores communication rules, the proximity detector receives location information from one or more mobile devices over a network, and determines, for each of the one or more mobile devices, a client-device proximity indicating the proximity between the mobile device and each other of the one or more mobile devices. The interaction controller communicates, over the network, an informational message to at least one of the one or more mobile devices based at least on the mobile-device proximity of the at least one mobile device and at least one of the plurality of communication rules, thereby causing the at least one mobile device to output an audiovisual content item.
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