1. A computer-implemented method comprising: selecting, by a computer system, an image from a set of images, wherein the image is editable by a first user and a second user; maintaining, by the computer system, attribute information about the first user and the second user; providing, by the computer system, based on the attribute information, a first permission to allow the first user to edit a first content area of the image and a second permission to allow the second user to edit a second content area of the image; and identifying a second image to be editable by the first user based on a time associated with the image and a time associated with the second image falling within a difference range.