NYT – Ravi Somaiya: “Many of the people who read this article will do so because Greg Marra, 26, a Facebook engineer, calculated that it was the kind of thing they might enjoy. Mr. Marra’s team designs the code that drives Facebook’s News Feed – the stream of updates, photographs, videos and stories that users see. He is also fast becoming one of the most influential people in the news business…About 30 percent of adults in the United States get their news on Facebook..Roughly once a week, he and his team of about 16 adjust the complex computer code that decides what to show a user when he or she first logs on to Facebook. The code is based on ‘thousands and thousands’ of metrics, Mr. Marra said, including what device a user is on, how many comments or likes a story has received and how long readers spend on an article.”