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Facebook's Account Kit Login System Works Via Phone Numbers, No Passwords Needed (softpedia.com)

 Facebook will know your phone number and your current login location...

At this year's F8 developer conference, Facebook announced a new tool called Account Kit, which can be used by app developers to support phone number-based login systems. 

 Every time the user wants to login, they have to enter their phone number. 

Facebook will then send them a verification code via SMS, which they have to enter on the site.

 The system was already tested live, and Facebook expects it to be widely adopted, allowing sites to offer users accounts that don't require them to memorize a new password.

Each developer has a 100,000 free confirmation SMS messages per month quota.

 Facebook claims to support SMS login operations for over 230 countries and regions, and in 40 different languages.