To quote an old cigarette commercial, you’ve come a long way, baby. As recently as 2009, social media ad revenue barely crossed the $2 billion mark. This year, eMarketer predicts the number will hit $5.54 billion, rising to $9.99 in 2013.
Right now, the US is responsible for most of the spend, but the rest of the world is coming on strong. By 2013, 51% of the ad revenue will come from outside the US.
As you can probably guess, most of the money is going to Facebook, but Twitter is pushing for more and more. eMarketer added LinkedIn to their predictions this year, figuring them for 3% of the ad revenue in 2011. This represents a big jump over the last few years, but eMarketer says that growth spurt is already leveling off.