According to BIA/Kelsey’s U.S. Local Media Forecast, social media advertising revenues will grow from $3.8 billion in 2011 to $9.8 billion in 2016, representing a compound annual growth rate of 21 percent. BIA/Kelsey, adviser to companies in the local media space, expects the local segment of U.S. social media advertising revenues to grow from $840 million in 2011...