When Facebook acquired Instagram in the spring of 2012, the photo-sharing app had rougly 50 million. The photo-sharing app reached 800 million users in September 2017.
You will find more statistics at Statista
Bubblecube
An Analytics, Marketing, Digital Marketing & Project Management Blog
Bubblecube 
I’m still not one of them. I have too much on my plate already with my WordPress blog and Facebook.
LikeLike