That's just clever wording. > We won’t post or share your WhatsApp number with others, including _ON_ Facebook. Is just saying that your number won't be visib

That's just clever wording. > We won’t post or share your WhatsApp number with others, including _ON_ Facebook. Is just saying that your number won't be visible to your facebook peeps. Which does not mean that Facebook (the company) won't get access to it.