According to a 2014 study by Forrester Research, Instagram even has the highest engagement rate for brands among all social networks. The engagement they see happening on Instagram (4.21 percent) compared to Facebook (0.07percent) and Twitter (0.03%) is staggering.
In other words, Instagram engagement is 58 times higher per follower than Facebook and 120 times more than Twitter!
And with the power of Facebook behind Instagram, it means that sending great targeted advertising, etc. is easy. Instagram is an easy to use, free platform, and the only thing it requires is a smartphone to set up an account and start using it.