Why Your Contact Information Is So Valuable to Social Media Sites
It's not easy to fully understand how personal data is used on social media sites. Straightforward questions are often stonewalled by Facebook and other sites with the claim that data practices are tied to proprietary advertising algorithms.
Yet, even computer scientists are surprised when they learn about the common data practices that have been discovered by social media researchers.
In fact, your contact information may be one of the primary drivers of social media ...