Snapchat has 173m Daily Active Users

"Daily active users (DAU)(1) – DAUs grew from 143 million in Q2 2016 to 173 million in Q2 2017, an increase of 30.5 million or 21% year-over-year. DAUs increased 7.3 million or 4% quarter-over-quarter, from 166 million in Q1 2017.
Average revenue per user (ARPU)(2) – ARPU was $1.05 in Q2 2017, an increase of 109% over Q2 2016 when ARPU was $0.50. ARPU increased 16% over Q1 2017 when ARPU was $0.90.
Hosting costs per DAU – Hosting costs per DAU were $0.61 in Q2 2017, as compared to $0.55 in Q2 2016 and $0.60 in Q1 2017.
Capital expenditures – Capital expenditures were $19.4 million in Q2 2017, as compared to $16.4 million in Q2 2016 and $18.0 million in Q1 2017."
Source:  Snap's Q2 Results, 8th August 2017