Yahoo has shut down Yahoo Screen, the company’s four-year-old video portal that had been a major component of chief exec Marissa Mayer’s turnaround strategy. Yahoo took a $42 million write-off on original video content in October, and while Yahoo Screen had yet to compete with video giant YouTube, comScore notes that the portal had about 15 million U.S. visitors in November. The portal had provided easy access to Yahoo’s video content — from digital magazines, concerts and football games to licensed reruns of “Saturday Night Live” and original series such as “Community.” Continue reading In Strategy Reversal, Yahoo Shutters its Online Video Portal