Boosted by solid growth in usage and advertising spend across major social networks, the global social network market continued to show strong growth in 2014, according to Strategy Analytics Global Social Network Forecast.

Ad spend on social networks grew a robust 41% globally in 2014 totaling over $15.3 billion, accounting for 11% of global digital ad spend. Facebook accounted for three-quarters of global social network ad spend in 2014, while Twitter accounted for 8%. In 2015, ad spend on social networks is expected to grow by 29%, totaling $19.8 billion.

The U.S. had the highest ratio of social network users to its population (62%) in 2014. One of the results of this is that he U.S. accounts for the largest share of global social network ad spend (41%), totaling $6.2 billion in 2014, up 35% YoY. On a per user basis this translates to an ad spend of $31.37 per user in 2014. This is expected to grow 27% to $39.84 in 2015.