What outlet is quickly climbing the list of top 10 social media sites? Instagram. The photo-based sharing application allows users to take a photo with a smartphone (or tablet) and share it with followers. You can download Instagram for free through the iTunes App Store or for Android. It is similar to Facebook in that you have followers and can see their photo updates in your feed, and anyone who follows you can see the photos that you post. Unlike Facebook, however, Instagram has no ads. All o