People have been getting riled up about the latest Facebook permission. There’s good reason to be concerned. 
Now the official response: If you add a phone number to your account, this allows us to confirm your phone number automatically by finding the confirmation code that we send via text message.
What does this mean? FACEBOOK IS READING YOUR TEXTS! Now for many folks they don’t care and that’s fine. Whoever, If you are a high security entity(HIPAA, accountant, lawyer..etc etc etc) then you most likely have all kinds of information going through your texts including “private” stuff form your customers. Facebook scans ALL texts looking for these codes form itself. given past warnings about Facebook’s invasive abilities do you honestly think they won’t slurp the rest? They might not now but I’m sure the will since you gave them permission to do so.
That’s two apps gone from my phone now. Starbucks and Facebook. While a smartphone isn’t secure in the leasta9blackberry is the only exception) jsut handing over everything is something you can put a throttle on.