[doorbellguy]

I'm not here to debate you on anecdotal data (I know 5 people off the top of my head who do use it).

It has a respectable 10,000,000+ installs on the google play store and ranks high on the apple store with 270,000+ reviews. Though not comparable with the likes of WhatsApp (which I personally use and prefer), I would not dismiss it as 'not' a mainstream option. We can agree to disagree for sure.

[0x38B]

Also anecdotal evidence, but my contacts are gradually showing up in Signal - and I continue to recommend it to friends and colleagues.

[mercer]

I was pleasantly surprised that my therapist (60+ years old) is now using it with his clients because of the coronavirus.

[ianlevesque]

WhatsApp hit two billion users last month.