Facebook is updating its "trending" feature that highlights hot topics on its social networking site, part of its effort to root out the kind of fake news stories that critics contend helped Donald Trump become president. With the changes announced, Facebook's trending list will consist of topics being covered by several publishers. Before, it focused on subjects drawing the biggest crowds of people sharing or commenting on posts.Will Cathcart, the company's vice president of product management, said in a blog post. Facebook also will stop customizing trending lists to cater to each user's personal interests. Instead, everyone located in the same region will see the same trending lists, which currently appear in the U.S., U.K., Canada, Australia and India.That change could widen the scope of information Facebook's users see, instead of just topics that reinforce what they may have already heard or read elsewhere. The broader perspective might reduce the chances of Facebook's users living in a "filter bubble" - only engaging with people and ideas with which they agree. Facebook introduced its trending list in 2014 in response to the popularity of a similar feature on Twitter, the short-messaging service that competes for people's attention and advertising revenue.Questions about Facebook's influence on what people are reading intensified last summer after a technology blog relying on an anonymous source reported that human editors routinely suppressed conservative viewpoints on the site. Facebook fired the small group of journalists overseeing its trending items and replaced them with an algorithm that was supposed to be a more neutral judge about what to put on the list.To discourage the creation of fake news in the first place, Facebook also is banishing perpetual publishers of false information from its lucrative ad network.