Facebook Nabs 4 Million Advertisers Amid Growth in Mobile

CNBC: Facebook has 4 million advertisers, up from 3 million in March, according to COO Sheryl Sandberg. “I think that’s because businesses know that consumers are spending time on mobile, and they need to be there,” Sandberg said. She said that video is “exploding” and especially important in Facebook’s dominance of the mobile platform.