Let me see if I got this straight. Facebook wants my cell phone number so that, after they get hacked, they can text me a new password? How would I know it is Facebook texting me and not the hackers...you know...because now they HAVE MY PHONE NUMBER!?!? 
If Facebook were to get hacked or an individual got their account stolen, having confirmed phone numbers lets Facebook wipe people’s passwords immediately and send them new ones via SMS. That means it wouldn’t have to rely on emailing users to get them to change their own passwords, which the Cloudmark blog showed doesn’t work so well since those messages often get ignored like spam.
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