This is a fascinating New York Times piece about how Saudi teens use apps to get around the conservative culture in that country:
Life for many young Saudis is an ecosystem of apps. Lacking free speech, they debate on Twitter. Since they cannot flirt at the mall, they do it on WhatsApp and Snapchat. Young women who cannot find jobs sell food or jewelry through Instagram. Since they are banned from driving, they get rides from car services like Uber and Careem. And in a country where shops close for five daily Muslim prayers, there are apps that issue a call to prayer from your pocket and calculate whether you can reach, say, the nearest Dunkin’ Donuts before it shuts.