Wow, that sounds interesting and slightly disturbing. A bit like my experience with a friends Android phone, cross-referencing data from the contacts app to as

Wow, that sounds interesting and slightly disturbing. A bit like my experience with a friends Android phone, cross-referencing data from the contacts app to associate e-mail addresses with phone numbers on Google services. There must be a whole bunch of systems like this, that are never surfaced to the public except trough these occasional glitches in the Matrix that only very few people actually recognize.