Identification of an application associated with a third party system and transmission of application installation information to a user by an online system

1. A method comprising:

storing, at an online system, data including information for identifying associations between one or more applications and one or more third party systems and information for installing the one or more applications;

receiving, at the online system, information from a third party system identifying the third party system and including information associated with a user of the online system for accessing the online system;

determining, by the online system, whether an application is associated with the third party system based on the stored data if the received information from the third party system associated with the user authorizes the user to access the online system;

if it is determined that the application is associated with the third party system, retrieving information from the stored data for installing the application associated with the third party system; and

transmitting, by the online system, the information for installing the application associated with the third party system to a client device associated with the user of the online system.

2. The method of claim 1 , wherein communicating information for installing the application associated with the third party system retrieved from the stored data to a client device associated with the user of the online system comprises:

transmitting a request for an indication of whether the application associated with the third party system is installed on the client device to the client device associated with the user; and

communicating the information for installing the application associated with the third party system to the client device if the indication received from the client device indicates the application associated with the third party system is not installed on the client device associated with the user.

3. The method of claim 1 , wherein retrieving the information for installing the application associated with the third party system from the stored data comprises:

determining whether the application associated with the third party system is installed on the client device associated with the user based on information associated with the user by the online system; and

retrieving the information for installing the application associated with the third party system from the stored data if it is determined that the application associated with the third party system is not installed on the client device associated with the user.

4. The method of claim 1 , wherein determining whether the application is associated with the third party system based on the stored data comprises:

determining a type associated with the client device associated with the user; and

determining whether an application associated with the type associated with the client device associated with the user is associated with the third party system.

5. The method of claim 4 , wherein the type associated with the client device associated with the user specifies an operating system associated with the client device associated with the user.

6. The method of claim 1 , wherein the information for installing the application associated with the third party system includes a link to a source including instructions for installing the application associated with the third party system.

7. The method of claim 6 , wherein the source is the third party system.

8. The method of claim 6 , wherein transmitting the information for installing the application associated with the third party system to the client device associated with the user of the online system comprises:

including the link in a text message transmitted from the online system to the client device associated with the user of the online system.

9. The method of claim 6 , wherein transmitting the information for installing the application associated with the third party system to the client device associated with the user of the online system comprises:

including the link in a notification message transmitted from the online system to the client device associated with the user of the online system.

10. The method of claim 1 , wherein transmitting the information for installing the application associated with the third party system to the client device associated with the user of the online system comprises:

transmitting instructions that, when executed by the client device associated with the user of the online system, configure an application installer executing on the client device associated with the user of the online system to install the application.

11. A computer program product comprising a non-transitory computer-readable storage medium having instructions encoded thereon that, when executed by a processor, cause the processor to:

store, at an online system, data including information identifying associations between one or more applications and one or more third party systems and information for installing the one or more applications;

receive, at the online system, information from a third party system identifying the third party system and including information associated with a user of the online system for accessing the online system;

determine, by the online system, whether an application is associated with the third party system based on the stored data if the received information from the third party system associated with the user authorizes the user to access the online system;

if it is dertermined that the application is associated with the third party system, retrieve information from the stored data for installing the application associated with the third party system; and

transmit, by the online system, the information for installing the application associated with the third party system to a client device associated with the user of the online system.

12. The computer program product of claim 11 , wherein communicating information for installing the application associated with the third party system retrieved from the stored data to a client device associated with the user of the online system comprises:

transmitting a request for an indication of whether the application associated with the third party system is installed on the client device to the client device associated with the user; and

communicating the information for installing the application associated with the third party system to the client device if the indication received from the client device indicates the application associated with the third party system is not installed on the client device associated with the user.

13. The computer program product of claim 11 , wherein retrieving the information for installing the application associated with the third party system from the stored data comprises:

determining whether the application associated with the third party system is installed on the client device associated with the user based on information associated with the user by the online system; and

retrieving the information for installing the application associated with the third party system from the stored data if it is determined that the application associated with the third party system is not installed on the client device associated with the user.

14. The computer program product of claim 11 , wherein determining whether the application is associated with the third party system based on the stored data comprises:

determining a type associated with the client device associated with the user; and

determining whether an application associated with the type associated with the client device associated with the user is associated with the third party system.

15. The computer program product of claim 14 , wherein the type associated with the client device associated with the user specifies an operating system associated with the client device associated with the user.

16. The computer program product of claim 11 , wherein the information for installing the application associated with the third party system includes a link to a source including instructions for installing the application associated with the third party system.

17. The computer program product of claim 16 , wherein the source is the third party system.

18. The computer program product of claim 16 , wherein transmitting the information for installing the application associated with the third party system to the client device associated with the user of the online system comprises:

including the link in a text message transmitted from the online system to the client device associated with the user of the online system.

19. The computer program product of claim 16 , wherein transmitting the information for installing the application associated with the third party system to the client device associated with the user of the online system comprises:

including the link in a notification message transmitted from the online system to the client device associated with the user of the online system.

20. The computer program product of claim 16 , wherein transmitting the information for installing the application associated with the third party system to the client device associated with the user of the online system comprises:

transmitting instructions that, when executed by the client device associated with the user of the online system, configure an application installer executing on the client device associated with the user of the online system to install the application.