Instagram is a free photo and video sharing app available on iPhone and Android. People can upload photos or videos to our service and share them with their followers or with a select group of friends. They can also view, comment and like posts shared by their friends on Instagram.

Instagram was started in San Francisco by Kevin Systrom and Mike Krieger, who initially tried creating a platform similar to Foursquare but then turned their attention exclusively to photo sharing. The word Instagram is an amalgam of "instant camera" and "telegram."

Instagram, @instagram (over 669 million followers)

Your profile is where you can find your photos, videos and settings on Instagram. Here, you can view what you've shared, see a list of the people you're following and who's following you. Learn how to: Add a bio or a website to your profile.