https://techcrunch.com/2018/06/20/instagram-1-billion-users/

Instagram’s meteoric rise continues, dwarfing the stagnant growth rates of Snapchat and Facebook. Today Instagram announced that it has reached 1 billion monthly active users, after reaching 800 million in September 2017 with 500 million daily users.

That massive audience could be a powerful draw for IGTV, the longer-form video hub its launching for creators today. While IGTV monetization options are expected in the future, content makers may flock to it early just to get exposure and build their fan base.