9. Instagram
Instagram is the new go-to app for taking photos, adding interesting filters to them and sharing them with the world. Over 300 million people use Instagram and the social aspects and simple interface are the reasons why this app is so popular. The best thing about Instagram is the fact that you’re not just limited to sharing your snaps on Instagram, as you can also easily add your photos to Facebook, Twitter, Tumblr and more with just a few clicks.