“Starting in the middle of next year, Facebook will stop showing users more ads in their news feed, the tactic it has been using to juice revenue growth for the past two years, the company said Wednesday. As a result, advertising growth will ‘come down meaningfully,’ Chief Financial Officer Dave Wehner said during a call with analysts. Facebook now expects a ‘much smaller contribution from this important factor going forward,’ he said. He added that Facebook expects to power growth by adding more users and boosting the amount of time they spend on the social network. Video is key to that strategy…”