1. A method implemented by one or more computing devices, the method comprising: receiving indications that a plurality of image sharing sessions are available for joining by one or more potential members, the image sharing sessions being broadcast without manual management on the part of a creator; prioritizing the plurality of image sharing sessions based on each one of a plurality of ranking criteria that are usable to determine a relative likelihood that a user wishes to join respective said image sharing sessions, the ranking criteria being based on a combination of information from a plurality of different social networking accounts, information from a plurality of different non-social networking sources, as well as information from image sharing session history, the information used for each one of the plurality of the ranking criteria being given custom weighting by the user; and forming a first list of suggested image sharing sessions that are available for the user to join, the first list of suggested image sharing sessions arranged, one to another, based on the prioritizing.