Data released by Facebook last fall showed that during one week in October, seven of the 10 most-engaged pages were primarily political, including those of President Donald J. Trump, Fox News, Breitbart and Occupy Democrats.Three years ago, Facebook said it would pull back on the amount of content posted to the site by news publishers and brands, an overhaul that it said put more focus on interaction among friends and family. At the time, Mr. Zuckerberg said he wanted to make sure Facebook’s products were “not just fun, but good for people.” He also said the company would take …
