In April, the tech giant Apple made a change to its privacy policy that prohibits advertisers from tracking users without their consent. Analysts predicted that this decision would lead to major changes in the $100 billion mobile ad market led by social networks like Facebook and Snapchat. These fears were confirmed for the latter last week when Snapchat announced that the policy prevented it from measuring the reach of its mobile ads, sending its stock price tumbling by 25 percent. Continue reading