It's kind of useless. I don't have an FB account, and have about ~300 email addresses with different retailers etc. But some of them have my phone out of neces

It's kind of useless. I don't have an FB account, and have about ~300 email addresses with different retailers etc. But some of them have my phone out of necessity. And so do my friends who use WhatsApp. Which means FB know my name, and what I buy from those retailers that share their data and have my phone number. I've recently pondered getting a trunk so I can give a different number to every retailer, like I do for emails. There's very little one can do to avoid FB, when they've managed to turn 30% of the world (literally, and closer to 80% in the west) into snitches on you. Stasi would have been envious. And FB happily provides it to any government who would just ask.