5. The system of any one of claims 1 through 4, wherein the user interface element displayed on the display screen of the second computing device is graphically associated with a graphical representation of the first user. 

6. The system of any one of claims 1 through 4, wherein: the user interface element displayed on the display screen of the second computing device comprises a graphical representation of the first user; and 

the computer-executable instructions further cause the one or more processing units to alter a visual appearance of the graphical representation of the first user to indicate that the second user has been requested to view the first section of the shared data. 

7. The system of any one of claims 1 through 4, wherein the computer- executable instructions further cause the one or more processing units to: 

determine a layout location of the first section relative to a layout location of the second section; and 

cause the user interface element to be displayed at a position on the display screen of the second computing device that represents the layout location of the first section relative to the layout location of the second section. 

8. The system of any one of claims 1 through 7, wherein the computer- executable instructions further cause the one or more processing units to graphically distinguish between a first portion of the first content displayed on the display screen of the second computing device and a second portion of the first content displayed on the display screen of the second computing device, wherein the first portion of the first content has been selected by the first user for review by the second user. 

9. A method comprising: causing first content of a shared data to be displayed on a display screen of a first computing device associated with a first user, wherein the shared data is accessible to a plurality of users in a multi-user sharing session; 

causing second content of the shared data to be displayed on a display screen of a second computing device associated with a second user, wherein the second content is different than the first content; 

receiving, from the first computing device, a request for the second user to view the first content; 

responsive to receiving the request, causing a user interface element to be displayed on the display screen of the second computing device, the user interface element indicating that the second user has been requested to view the first content; 

