All the social media providers are beginning to insist that they should know your cell phone number.  They do this because cookies are becoming outdated, and are being replaced by 1st party trackers.  In short, the FaceBk app will be able to see where you go, how much time you spend there, and get a shorthand version of your life, and sell the data to companies who will buy you as part of a demographically selected group.  ZERO PRIVACY!  Is Elon Musk going to throw the election is Trump's direction, to curry favors with Putin's puppy? Is Elon Milo-MinderBinder just looking out for number One?