Notifying content owners of related posts

1. A method, comprising:

receiving a request to generate a post data item at a first location, the post data item including a reference to a content item located at a second location;

determining whether the post data item at the first location is a public post data item or a private post data item;

when the post data item is a public post data item:

accessing a notification tag associated with the content item, the notification tag identifying a destination for notification;

sending, by a processor, a notification to the destination, the notification identifying that the content item at the second location has been referenced in the post data item at the first location; and

when the post data item is a private post data item:

determining to not send a notification.

2. The method of claim 1 ,

wherein the first location is defined by a social network page;

wherein the second location is defined by a content page; and

wherein the social network page and the content page do not share a common domain.

3. The method of claim 1 , wherein the destination is defined by one or more of an e-mail address, a username, or a user identifier on a social network.

4. The method of claim 1 , wherein the notification provides access to a moderation interface for approving or disapproving the post data item for display at the second location.

5. The method of claim 1 , wherein the reference to the content item is a URL.

6. The method of claim 1 , wherein the content item is selected from an image, video, audio, or text.

7. The method of claim 1 , further comprising providing the post data item at the second location in a stream of post data items configured to aggregate post data items referencing the content item from multiple locations.

8. A method, comprising:

receiving a request from a first user to generate a post data item for display on a first property, the post data item including a reference to a content item located on a second property;

determining whether the post data item for display on the first property is a public post data item or a private post data item;

when the post data item is a public post data item:

identifying an owner to be notified when the content item is shared in the post data item based on the request, wherein identifying the owner includes performing a look-up in a registry, the registry defining a correlation between the reference and the identified owner;

generating, by a processor, a notification to the owner, the notification identifying that the content item at the second property has been referenced in the post data item at the first property; and

when the post data item is a private post data item:

determining to not generate a notification.

9. The method of claim 8 ,

wherein the first property is defined by a social network; and

wherein the second property is not defined by the social network.

10. The method of claim 8 ,

wherein the first property is defined by a first web page;

wherein the second property is defined by a second web page;

wherein the first web page and the second web page do not share a common domain.

11. The method of claim 8 , wherein the reference to the content item is a URL.

12. The method of claim 8 , wherein identifying the owner includes identifying an address of the owner to which the notification is sent.

13. The method of claim 8 , wherein generating the notification includes one or more of sending an e-mail notification to the owner or sending a mobile push notification to the owner.

14. The method of claim 8 , wherein the content item is selected from an image, video, audio, or text.

15. The method of claim 8 , wherein the notification provides access to a moderation interface for approving or disapproving the post data item for display on the second property.

16. A non-transitory computer-readable medium having instructions which, when executed by a processor, cause the processor to perform operations comprising:

receiving a request to generate a post data item at a first location, the post data item including a reference to a content item located at a second location;

determining whether the post data item at the first location is a public post data item or a private post data item;

when the post data item is a public post data item:

accessing a notification tag associated with the content item, the notification tag identifying a destination for notification;

sending a notification to the destination, the notification identifying that the content item at the second location has been referenced in the post data item at the first location; and

when the post data item is a private post data item:

determining to not send a notification.

17. The non-transitory computer-readable medium of claim 16 ,

wherein the first location is defined by a social network page;

wherein the second location is defined by a content page; and

wherein the social network page and the content page do not share a common domain.

18. The non-transitory computer-readable medium of claim 16 , wherein the destination is defined by one or more of an e-mail address or a username.

19. The non-transitory computer-readable medium of claim 16 , wherein the notification provides access to a moderation interface for approving or disapproving the post data item for display at the second location.

20. The non-transitory computer-readable medium of claim 16 , wherein the reference to the content item is a URL.

21. The non-transitory computer-readable medium of claim 16 , wherein the content item is selected from an image, video, audio, or text.

22. The non-transitory computer-readable medium of claim 16 , wherein the operations further comprise providing the post data item at the second location in a stream of post data items configured to aggregate post data items referencing the content item from multiple locations.