1. A non-transitory computer-readable storage medium comprising instructions configured for execution by a computing device, to cause the computing device to perform operations, comprising: receiving a query associated with a user, the query comprising an intersection criteria, the intersection criteria comprising a specified location and a specified timeframe; generating an intersection space responsive to the query by: accessing a plurality of stories, each story submitted by a submitter and comprising one or more content items and having respective intersection metadata, the intersection metadata of each story comprising a location and a timeframe pertaining to the story, selecting stories for inclusion in the intersection space that each have intersection metadata corresponding to the location and the timeframe of the intersection criteria, accessing timeframe-dependent access controls provided by respective submitters that submitted the selected stories; filtering the selected stories based on the timeframe-dependent access controls, such that each remaining selected story in the intersection space is associated with one or more timeframes the user is authorized to access based on the corresponding timeframe-dependent access controls; and displaying the intersection space to the user on a display device, the display comprising indicators of one or more of the filtered stories selected for inclusion in the intersection space.
8. The non-transitory computer-readable storage medium of claim 1 , wherein a timeframe-dependent access control of a submitter permits user access to stories that correspond to a first timeframe and denies user access to stories that correspond to a second, different timeframe.