#1 Mobile Ad Network

he world's biggest social network brings a tightly honed experience to the iPhone and iPod touch, but nonetheless still enables you to access your contacts, feeds and other important information. This sense of focus makes it in many ways superior to using Facebook in a desktop browser.

Last year we launched a way for developers to reach the right audience, at scale. So far this year, mobile app ads have driven over 145 million installs in the Google Play and Apple App stores.

However, app discoverability is only one of the challenges of building a mobile app. Developers are also faced with the challenge of getting installed users to return and remain active within their apps. According to a study by Localytics, a Mobile Measurement Partner, 66% of app users only open apps between one and 10 times.

Best App for Iphone and Ipad

38. SPLIT PIC (IPHONE/IPAD) This one’s a photography app based around a gimmick, but it takes advantage of said gimmick really well. The basic thinking is you can ‘clone’ yourself into an image more than once by shooting the same photo several times as a split scene. But with the app’s well-designed merging tool and filters, there’s scope for greater creativity and experimentation here.

In-app-purchases give you access to more filters and layouts, and you can unlock everything for £1.99. However, the free app’s more than enough to get started with.