1. A computer implemented method comprising: obtaining from a first collection sharing device a first image collection digest; obtaining from a second collection sharing device a second image collection digest; determining a collection proximity by comparing the first image collection digest and the second image collection digest wherein a proximity match is determined by comparing the collection proximity to a matching threshold; and, performing an action based on the proximity match, wherein the action performed comprises notifying a user of the first collection sharing device that the second collection sharing device is communicatively coupled over a network.