How Facebook, Twitter Helped Lead Trump to Victory

America just endured its first presidential election in which the majority of the electorate got its news from social media. And the outcome is already prompting soul searching by the companies that shaped it.

Facebook will have to contend with mounting dissatisfaction over its role as the most widely used news filter in history. Forty-four percent of American adults get their media through the site, many consuming news from partisan sources with which they agree. The proliferation of fake news on Facebook has also been a problem: false stories about the Clinton family committing murder and Huma Abedin being a terrorist flew fast and furious despite refutations from responsible news organizations. Those stories shaped public opinion, said Ed Wasserman, the dean of the University of California, Berkeley Graduate School of Journalism. "This is a landmark," he said. "Trump was able to get his message out in a way that was vastly influential without undergoing the usual kinds of quality checks that we associate with reaching mass public. You had a whole set of media having influence without really having authority. And the media that spoke with authority, the authority that comes after careful fact checking, didn't really have the influence."