Bloomberg: Yahoo is rolling out 18 new series in a digital video push, stepping up its efforts to woo marketers and consumers with premium content. The new offerings from the web portal will bring its total to 55 series, the company said during a presentation in New York. The new content includes original programming, live broadcasts and videos for its magazines that are focused on subjects such as cars and food. CEO Marissa Mayer is counting on video to help drive a turnaround at the web portal, which has struggled against rivals such as Google and Facebook.