Our organization currently has about 30+ ArcGIS.com Users, and over the course of the past few years, users have uploaded multiple layers, and created multiple maps and apps. We have relized that some users haven't always followed our best practices. We need to clean up our content, but we don't know if all of the layers are actually used, and if the maps are used by an app. Does anyone know how to determine which layers are used by which maps, and which maps are used by which apps. I'm looking for an automated approach.