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Re:Dear Googles: Stop asking by alextingle on Sunday November 17, 2013 @04:40AM (#6748246)
No, they don't. FB want to know what your number is, but they don't prevent you from using their service if you can't/won't give it to them.
Re:Dear Googles: Stop asking by dboyd on Sunday November 17, 2013 @07:54PM (#6751870)
I tried to create an account the other day and they explicitly required a mobile phone number they could send an SMS too.

I suspect that different people see different behavior.