Other services : Please type your phone number to verify that it is you. It will be only used for verification process.
Me : Sure, why not? (Happily types in my number)

Facebook : Please type your phone number to verify that it is you.
Me : Hmmm (sees help)
Facebook : It will be used for verification process and will be visible to your friends. You can always change the scope settings.
Me : (reads as...) It will be used for verification process and will be visible to your friends and will be automatically sent to the NSA for free. You can always change the scope settings when you become the CEO of Facebook.

#deletefacebook