Treemap of four adolescents’ application use. In each panel, the size of the tiles indicates the proportion of total screen time spent with each specific app (e.g., YouTube, Snapchat). The color of the tile indicates the type/category of application (as designated on Google Play; e.g., Video Players & Editors, Social). For example, in Panel A the largest tile, labeled Snapchat indicated that this Social application (dark red) is Participant #1’s most frequently used app. The next largest tile, labeled mobile_game indicated the second most frequently used app, and so on.