According to Tech Review:
Facebook “whitelisted” certain companies, meaning that they still had full access to users’ friends’ data after platform changes in 2014-15, including Airbnb and Netflix.
Facebook aggressively tried to shut down competition. When Twitter launched video-clip platform Vine, Facebook revoked access to its API. It also used data on customers’ usage of mobile apps (collected without their knowledge) to work out acquisition targets.
Facebook accessed users’ call history without alerting them, to make “People You May Know” suggestions and tweak news-feed rankings. Facebook made it as hard as possible for users to know this was happening.
It’s a hoot, especially when one compares the tone of the emails with Zuckerberg’s sanctimonious cant in his public utterances.