Most people here have both FB messenger and WhatsApp (and likely Instagram), so if you have one of those you're fine. I've tried not to use /any/ facebook product for a while and that's when I ran into bubble color issues.
Indeed, I simply tell people I don't have WhatsApp and we usually end up with FB messenger. My claim was not that I don't know people who use WhatsApp (I do!) but rather that FB messenger + G Hangouts about covers everyone for me.