Instagram

Kevin Systrom and Mike Krieger published an Instagram app  for sharing photos and short videos in the App Store. The app gained a lot of popularity among users within a few months and in December of the same year, more than 1 million users were using it. In April 2012, Instagram was acquired by Facebook  for approximately $1 billion. In February 2013, the number of active monthly Instagram users reached the 100 million milestone.

2010/10/06

https://www.livescience.com/20727-internet-history.html