• by Mark Walsh  @markfwal, June 5, 2013

YouTube’s ad sales from mobile devices has tripled in the last six months, adding as much as an estimated $350 million in revenue to the Google-owned video hub, according to a Bloomberg report. Nearly a quarter of YouTube’s 1 billion users worldwide access the service through handheld devices, driving up mobile ad spending, Lucas Watson, VP of sales, at YouTube, said. eMarketer projects U.S. mobile video ad revenue will grow 10-fold from last year to $2.69 billion by 2017.