22. The system of claim 21 , wherein the second user modification is associated with a graphical element of the document, and presenting the animation associated with the second user modification comprises animating the graphical element on the display of the first user device.
22. The system of claim 21 , wherein the second user modification is associated with a graphical element of the document, and presenting the animation associated with the second user modification comprises animating the graphical element on the display of the first user device. 23. The system of claim 22 , wherein the instructions further cause: determining a style of animation to present based on a type of the second user modification; and presenting the animation having the determined style.