1337cat

Hi, ex-FB'er here.

> Facebook has nearly limitless access to all the phone numbers, email addresses, home addresses, and social media handles most people on Earth have ever used.

They're overlooking an obvious one which is location. If you and a stranger use your FB apps from the same restaurant the same evening, the stranger will appear higher in your search results of someone with their name. It would be reasonable for this to feed PYMK.