This is one of those things that we can't believe are only now being added to an app. See, Instagram is all about pictures and videos, and pinching to zoom on images and videos is basically second nature on a device with a touchscreen. Yet only today has Instagram added that capability - and for now it's only available in its app for iOS. Android support is supposedly coming in the next few weeks. Until then, Instagram users rocking an iPhone or iPad are once again getting to play with a new feature first. To get an idea of how pinching to zoom works in Instagram, have a look at the quick...
Source: http://www.gsmarena.com/instagram_for_ios_finally_lets_you_pinch_to_zoom_on_photos_and_videos-news-20261.php