Facebook ads has a tool called audience insights, where you can view the stats for an interest. I typed in iOS App Store, and here are the results: http://i.imgur.com/nsx4dWd.png -> 56% women while only 44% men http://i.imgur.com/keAon6y.png -> Most common lifestyles http://i.imgur.com/QqQzWuz.png -> Job titles Try the tool out yourself -> https://www.facebook.com/ads/audience-insights/