Why can't companies like WhatsApp and Facebook get it through their thick skulls that, if people wanted to share their phone number with another site, we would do so ourselves. There are reasons (that are none of their business) why we share our phone number on one site but not another. Thanks for just taking care of that for us without asking. "By connecting your phone number with Facebook's systems, Facebook can offer better friend suggestions and show you more relevant ads if you have an account with them," reads an excerpt of WhatsApp's post. "For example, you might see an ad from a company you already work with, rather than one from someone you've never heard of."