My website's advertising is designed for desktops. Google Analytics shows that 2/3 of visitors come from mobile. Is there a way to show desktop advertising to desktop users and other adverting to mobile users? So: Where can I get started to figure out how to show different advertising to different users? Exit intent pop ups and corner peel ads are useful on the desktop but I need something like a little leaderboard ad for mobile users. Thank you for your time.