Replacing typed emoticon with user photo

1. A method comprising:

by one or more computing devices, receiving input from a user participating in a message session;

by the computing devices, detecting an emoticon in the received input;

by the computing devices, analyzing a plurality of images associated with a user node in a social graph for a social-networking system, wherein the images are analyzed to detect expressions that correspond to an expression of the typed emoticon, and wherein the user node represents the user;

by the computing devices, identifying, based on the analysis and a predefined mapping of emoticons to stored images in a data store of the social-networking system, a particular one of the images corresponding to the emoticon; and

by the computing devices, replacing the emoticon with the particular one of the images in the message session.

2. The method of claim 1 , wherein the identifying the particular image further comprises receiving a selection of the particular image from a list suggested to the user.

3. The method of claim 1 , wherein the identifying the particular image comprises identifying the particular image based on a previous emoticon replacement with the particular image by the user.

4. The method of claim 1 , wherein the identifying an image corresponding to the emoticon comprises identifying the image from an image capture input device.

5. The method of claim 1 , wherein the emoticon is replaced with the particular image only if a second user has permission to view the particular image.

6. The method of claim 1 , wherein at least one of the computing devices is a server managing the message session.

7. The method of claim 1 , wherein the detecting comprises:

analyzing text of the received input; and

identifying the emoticon based on the analysis of the text.

8. One or more computer-readable non-transitory storage media in one or more computing systems, the media embodying logic that is operable when executed to:

receive input from a user participating in a message session;

detect an emoticon in the received input;

analyze a plurality of images associated with a user node in a social graph for a social-networking system, wherein the images are analyzed to detect expressions that correspond to an expression of the typed emoticon, and wherein the user node represents the user;

identify based on the analysis and a predefined mapping of emoticons to stored images in a data store of the social-networking system, a particular one of the images corresponding to the emoticon; and

replace the emoticon with the particular one of the images in the message session.

9. The media of claim 8 , wherein the identifying the particular image further comprises receiving a selection of the particular image from a list suggested to the user.

10. The media of claim 8 , wherein the identifying the particular image comprises identifying the particular image based on a previous emoticon replacement with the particular image by the user.

11. The media of claim 8 , wherein the identifying an image corresponding to the emoticon comprises identifying the image from an image capture input device.

12. The media of claim 8 , wherein the emoticon is replaced with the particular image only if a second user has permission to view the particular image.

13. The media of claim 8 , wherein at least one of the computing devices is a server managing the message session.

14. The media of claim 8 , wherein the detecting comprises:

analyzing text of the received input; and

identifying the emoticon based on the analysis of the text.

15. A first computing system comprising:

a memory comprising instructions executable by one or more processors; and

the one or more processors coupled to the memory and operable to execute the instructions, the one or more processors being operable when executing the instructions to:

receive input from a user participating in a message session;

detect an emoticon in the received input;

analyze a plurality of images associated with a user node in a social graph for a social-networking system, wherein the images are analyzed to detect expressions that correspond to an expression of the typed emoticon, and wherein the user node represents the user;

identify based on the analysis and a predefined mapping of emoticons to stored images in a data store of the social-networking system, a particular one of the images corresponding to the emoticon; and

replace the emoticon with the particular one of the images in the message session.

16. The system of claim 15 , the one or more processors being further operable when executing the instructions to replace the emoticon with the particular image only if a second user has permission to view the particular image.

17. The system of claim 15 , wherein the identifying an image corresponding to the emoticon comprises identifying the image from an image capture input device.

18. The system of claim 15 , wherein the detecting comprises:

analyzing text of the received input; and

identifying the emoticon based on the analysis of the text.