Snapchat has 158m daily active users

"A daily habit. In 2012, Snap says it went from 1,000 daily users to 100,000. A year later, it was at 1 million daily users. Now 158 million people on average use the service and create over 2.5 billion Snaps -- short videos or images -- every day. On average, more than 60 percent of the company's daily active users create Snaps with its camera every day. Users visit Snapchat more than 18 times a day, on average, and spend 25 to 30 minutes on the app.
[...]
Slowing growth? Snap warned that its daily active user base may not continue to grow, and that its user growth showed a slowdown in the past couple of quarters of 2016. In the beginning of the September quarter, its base increased 7 percent from the June quarter. But in the latter part of the September period, its user base was "relatively flat," which resulted in an overall 4 percent sequential rise. It also added only 4.5 percent more users from September to December (before that, the user base had risen sequentially in the double digits on a percentage basis).
iPhone effect. The "majority" of Snap's users have iPhones. "As a result, although our products work with Android mobile devices, we have prioritized development of our products to operate with iOS operating systems rather than smartphones with Android operating systems." Sorry, Google."

Source:  Data from Snap's IPO documents, reported by CNet, 3rd February 2017