1 Cross-device behaviours in a mobile-first world, Google data, based on convenience sample of opt-in US cross-device users, age 18-49 who signed into Google and turned on Location History (mobile Android-only & IE/Chrome/Firefox desktop browser). Calibrated to population studied, January 2016 - March 2016. Location analysis excludes locations that are not identifiable. A store refers to a commercial entity that offers service or goods (examples: department store, big box retailer, clothing store, etc) and is not part of a shopping centre.