In the third quarter of 2014, Facebook brought in $2.96 billion in advertising revenue, 66 percent of which came from mobile ads. Twitter generated 85% of its total revenue from mobile advertising in the same quarter, representing about $320 million.
On Facebook, desktop ads have 8.1x higher click-through rates and mobile ads have 9.1x higher click-through rates than normal web ads. Meanwhile, Promoted Tweets have shown average engagement rates of 1-3 percent—much higher than traditional banner ads. It’s no wonder that by June of this year, nearly 80% of US marketers were using promoted Tweets.