Hashing your phone number and linking it with other phone numbers (also hashed) meets all of their promises and yet still allows them to build an object graph o

Hashing your phone number and linking it with other phone numbers (also hashed) meets all of their promises and yet still allows them to build an object graph of who's connected to whom, who communicates when, how often, and with whom, and match all that data with what's in facebook already with the data that's in your address book on your phone, even if you never install the FB app... metadata, all the way down.