Facebook leveraged user data to fight rivals and help friends

Zuckerberg, along with his board and management team, found ways to tap Facebook users’ data — including information about friends, relationships and photos — as leverage over the companies it partnered with. In some cases, Facebook would reward partners by giving them preferential access to certain types of user data while denying the same access to rival companies.

NBC

[Have you yet dropped facebook?]

Facebook Is Giving Advertisers Access to Your Shadow Contact Information

Alan Mislove studies how privacy works on social networks and had a theory that Facebook is letting advertisers reach users with contact information collected in surprising ways.

One of the many ways that ads get in front of your eyeballs on Facebook and Instagram is that the social networking giant lets an advertiser upload a list of phone numbers or email addresses it has on file; it will then put an ad in front of accounts associated with that contact information.

Gizmodo