Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for transmitting a content data set to a computing device for displaying digital content to an author user, the author user having authored the digital content, receiving user input from the author user, the user input corresponding to the digital content, and, in response to receiving the user input, transmitting first data and second data to the computing device for display to the author user, the first data comprising a number of contacts that are able to access the digital content and the second data indicating one or more relationships between the author user and the contacts.