Tim Cook answered
Since its launch in October 2010, Instagram has picked up over a hundred million users who signed up to exchange messages and share photos and videos.
Where to Find Instagram, What to Do With it
In 2013, Instagram brought out a desktop facility, but the iPhone app continues to be preferred environment for users to interact.
Users can follow each other and comment, like, and tag each other in pictures, not only in Instagram but also to other social networks such as Twitter and Flickr. Films can likewise be shared.
To find out more, watch this online Instagram tutorial: