It uses iOS’s SMS Filtering framework, which does the filtering in a privacy-preserving way: https://developer.apple.com/documentation/sms_and_call_repor...
I would have gone with a more editorialized title but the submission guidelines prohibit it.
https://www.broadbandsearch.net/blog/average-daily-time-on-s... puts it at 58 minutes, and https://www.nytimes.com/2016/05/06/business/facebook-bends-t... (from 2016) notes that it's 50 minutes (apparently reporting by FB in an earnings report).
Source? That sounds very high. Regardless, it's definitely a silly statistic. It could be that people just lost interest in Facebook.
Not sure how they collected the data though.
50M hours / 1.5B DAU is about .03 hours, or about <2 minutes per person. The average person spends 1h15m on FB, this is less than a 3% drop in overall time, but likely a larger proportion of that time is spent scrolling and seeing more ads than it is fixed on a single video.
Does anyone have links / suggestions on how to set this up?