Facebook Dumps Web Ad Platform, Turns to Mobile

CNBC: Not so long ago, Facebook investors doubted the social network’s ability to win on mobile. Now it’s practically the only thing that matters. Facebook said Wednesday that it’s doing away with a desktop advertising platform and doubling down on smartphone ads. Facebook Exchange will no longer be available to advertisers starting in November. Since a troubled IPO in 2012, Facebook has transitioned from a desktop-centric business to a dominant force in mobile.