Facebook leveraged user data to fight rivals and help friends

Facebook CEO Mark Zuckerberg oversaw plans to consolidate the social network's power and control competitors by treating its users' data as a bargaining chip. 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.