Restricted group content collection

1. A method comprising:

receiving, by one or more processors, input from a first client device that initiates a group story in relation to an event, the input designating one or more parameters of the group story and the one or more parameters comprising a geo-fence;

associating a posting window with the group story that defines a time window during which content is allowed to be associated with the group story;

enabling a second client device to post content to the group story based on the posting window associated with the group story, the second client device being enabled to post the content in response to determining that the content was captured from within the geo-fence and during the time window during which content is allowed to be associated with the group story; and

determining, based on metadata associated with the content, that the content was captured from within the geo-fence between start and end times of the event.

2. The method of claim 1 , further comprising:

after the group story has been initiated, determining that the second client device was previously located within the geo-fence associated with a geographic location of the event between the start time and the end time to enable the second client device to post content.

3. The method of claim 1 , further comprising:

receiving location data from the second client device that indicates a geographic location of the second client device; and

determining that the received location data of the second client device satisfies one or more parameters of the group story.

4. The method of claim 1 , further comprising:

determining, based on an entity graph representing connections between a plurality of users registered with a messaging server system, that a first user, associated with the first client device, is within a threshold degree of connection with a second user associated with the second client device; and

causing the first client device to present a user interface element that enables the second user to submit given content to the group story.

5. The method of claim 1 , further comprising:

obtaining the metadata associated with content received from the second client device, the metadata indicating a time at which the content was captured and a geographic location at which the content was captured;

transmitting, to the first client device, the content received from the second client device;

receiving, from the first client device, an authorization message to add the content to the group story; and

in response to receiving the authorization message, adding the content to the group story.

6. The method of claim 1 , further comprising:

receiving an access request from a third client device associated with a third user; and

determining that the third user is authorized to view the group story.

7. The method of claim 6 , wherein determining that the third user is authorized to view the group story comprises:

determining, based on an entity graph, that the third user is within a threshold degree of connection with a first user associated with the first client device.

8. The method of claim 1 , further comprising determining that the group story has remained inactive for a threshold period of time.

9. The method of claim 8 , further comprising:

deleting the group story in response to determining that the group story has remained inactive for the threshold period of time.

10. The method of claim 1 , wherein the posting window begins at a start time of the event and ends at a threshold period of time following the end time of the event.

11. A system comprising:

one or more computer processors; and

one or more computer-readable mediums storing instructions that, when executed by the one or more computer processors, cause the processors to perform operations comprising:

receiving input from a first client device that initiates a group story in relation to an event, the input designating one or more parameters of the group story and the one or more parameters comprising a geo-fence;

associating a posting window with the group story that defines a time window during which content is allowed to be associated with the group story;

enabling a second client device to post content to the group story based on the posting window associated with the group story, the second client device being enabled to post the content in response to determining that the content was captured from within the geo-fence and during the time window during which content is allowed to be associated with the group story; and

determining, based on metadata associated with the content, that the content was captured from within the geo-fence between start and end times of the event.

12. The system of claim 11 , wherein the event associated with a start time and an end time further comprising operations for after the group story has been initiated, determining that the second client device was previously located within a geo-fence associated with a geographic location of the event between the start time and the end time.

13. The system of claim 11 , wherein the operations further comprise:

receiving location data from the second client device that indicates a geographic location of the second client device; and

determining that the received location data of the second client device satisfies one or more parameters of the group story to enable the second client device to post content.

14. The system of claim 11 , wherein the operations further comprise:

determining, based on an entity graph representing connections between a plurality of users registered with a messaging server system, that a first user, associated with the first client device, is within a threshold degree of connection with a second user associated with the second client device; and

causing the first client device to present a user interface element that enables the second user to submit given content to the group story.

15. The system of claim 11 , wherein the operations further comprise:

obtaining the metadata associated with content received from the second client device, the metadata indicating a time at which the content was captured and a geographic location at which the content was captured;

transmitting, to the first client device, the content received from the second client device;

receiving, from the first client device, an authorization message to add the content to the group story; and

in response to receiving the authorization message, adding the content to the group story.

16. The system of claim 11 , wherein the operations further comprise:

receiving an access request from a third client device associated with a third user; and

determining that the third user is authorized to view the group story.

17. The system of claim 11 , wherein the operations further comprise deleting the group story after a threshold period of time of inactivity related to the group story.

18. A non-transitory computer-readable medium storing instructions that, when executed by one or more computer processors of a messaging server system, cause the messaging server system to perform operations comprising:

receiving input from a first client device that initiates a group story in relation to an event, the input designating one or more parameters of the group story and the one or more parameters comprising a geo-fence;

associating a posting window with the group story that defines a time window during which content is allowed to be associated with the group story;

enabling a second client device to post content to the group story based on the posting window associated with the group story, the second client device being enabled to post the content in response to determining that the content was captured from within the geo-fence and during the time window during which content is allowed to be associated with the group story; and

determining, based on metadata associated with the content, that the content was captured from within the geo-fence between start and end times of the event.

19. The non-transitory computer-readable medium of claim 18 , the operations comprising:

after the group story has been initiated, determining that the second client device was previously located within the geo-fence associated with a geographic location of the event between the start time and the end time to enable the second client device to post content.

20. The non-transitory computer-readable medium of claim 18 , the operations further comprising:

receiving location data from the second client device that indicates a geographic location of the second client device; and

determining that the received location data of the second client device satisfies one or more parameters of the group story.