Apple, Facebook Trade Barbs Over Privacy-Focused Business Models

Tim Cook criticized app-tracking tools that he said turn consumers into an advertising product a day after Mark Zuckerberg accused Apple of using its platform to interfere with how Facebook apps work.Tim Cook criticized app-tracking tools that he said turn consumers into an advertising product a day after Mark Zuckerberg accused Apple of using its platform to interfere with how Facebook apps work.Read MorePAIDWSJ.com: US Business