10. A system, comprising: a network-accessible computing device comprising a processor and a datastore, the datastore comprising a plurality of story records, each story record submitted by a submitter and comprising one or more content items, and each story record assigned a respective timeframe access control and having respective intersection metadata, the intersection metadata of each story record comprising a location and a timeframe pertaining to the story record; an intersection module operating on the processor, wherein the intersection module is configured to: generate an intersection space in response to a query from a user, the query comprising intersection criteria comprising a specified location and a specified timeframe, by selecting story records from the datastore for inclusion in the intersection space each having a location that matches the location of the intersection criteria and a timeframe that matches the timeframe of the intersection criteria, and filtering the story records selected for inclusion in the intersection space based on the timeframe access controls associated with the respective story records, each timeframe access control specified by a submitter that submitted one or more of the selected story records such that each remaining selected story record is associated with one or more timeframes indicated, by a submitter that submitted the remaining selected story record, as being accessible to the user; and an interface module to present the intersection space to the user on a display, the intersection space comprising indicators of one or more of the filtered story records selected for inclusion in the intersection space.
10. A system, comprising: a network-accessible computing device comprising a processor and a datastore, the datastore comprising a plurality of story records, each story record submitted by a submitter and comprising one or more content items, and each story record assigned a respective timeframe access control and having respective intersection metadata, the intersection metadata of each story record comprising a location and a timeframe pertaining to the story record; an intersection module operating on the processor, wherein the intersection module is configured to: generate an intersection space in response to a query from a user, the query comprising intersection criteria comprising a specified location and a specified timeframe, by selecting story records from the datastore for inclusion in the intersection space each having a location that matches the location of the intersection criteria and a timeframe that matches the timeframe of the intersection criteria, and filtering the story records selected for inclusion in the intersection space based on the timeframe access controls associated with the respective story records, each timeframe access control specified by a submitter that submitted one or more of the selected story records such that each remaining selected story record is associated with one or more timeframes indicated, by a submitter that submitted the remaining selected story record, as being accessible to the user; and an interface module to present the intersection space to the user on a display, the intersection space comprising indicators of one or more of the filtered story records selected for inclusion in the intersection space. 15. The system of claim 10 , wherein a timeframe access control of a submitter permits access to story records associated with a particular timeframe to a first set of users and denies access to the story records associated with the particular timeframe to a second, different set of users.