It's absolutely scary how tight a grip Facebook Inc. has on social lives in our societies.
I have neither a Facebook nor a WhatsApp account, but I can feel on a daily basis how small a minority I belong to.
If my wife didn't have WhatsApp either, I'd be pretty much cut off from social life, because currently the communication with our common friends happens almost exclusively there.
And ironically, even mildly anti-capitalist climate activists communicate all their activities via Facebook.