LAS VEGAS, NV - JANUARY 07: Recording artist John Legend performs during a keynote address by Yahoo! President and CEO Marissa Mayer at the 2014 International CES at The Las Vegas Hotel & Casino on January 7, 2014 in Las Vegas, Nevada. CES, the world's largest annual consumer technology trade show, runs through January 10 and is expected to feature 3,200 exhibitors showing off their latest products and services to about 150,000 attendees. (Photo: Getty)