Readers of some of the top U.S. news sites are more engaged when they go directly to the website rather than through Facebook, according to a study from the Pew Research Center released on Monday. The research found that users who come directly to a news site spend about three times as long per visit, or almost five minutes on average. Those who find the news by searching or through Facebook spend about two minutes. Direct visitors also view about five times as many pages per month as those coming through Facebook referrals or through search engines such as Google Inc. The study is revealing because increasingly news organizations are relying on social media platforms to distribute content especially to reach younger readers.