US social media advertising revenues will increase from $3.8 billion in 2011 to $4.8 billion this year, and then more than double to $9.8 billion in 2016, details BIA/Kelsey in a May 2012 forecast. Defining social media advertising as money spent on advertising formats across social networks, the company predicts that display, which makes up the lion’s share of spending, will grow from $3.6 billion in 2011 to $4.6 billion this year and $9.2 billion in 2016. The social non-display segment is expected to grow from $140 million in 2011 to $630 million in 2016. The compound annual growth rate for the total spend is estimated at 21% (20.6% for display, and 35.2% for non-display). Read the rest at Marketing Charts.