Anecdotally that's been fun to observe in the media. I remember at one point it was "Hours/day of engagement per user". At some point it became Active Users (at

Anecdotally that's been fun to observe in the media. I remember at one point it was "Hours/day of engagement per user". At some point it became Active Users (at least once per day). Recently it's been Active Users (at least once per month). I've never gone back to look at official filings or press releases from any company, but it feels like they're constantly redefining how widespread they are.