Ad spending on social media continues to grow at an impressive rate and is taking an increasing share of marketers’ interactive marketing budgets. While engaging formats on mobile and better targeting capabilities keep driving up the cost per ad for ads on social networks, we expect new app-only social networks and new ad formats like video to fuel growth in the future. The forecast details global social media advertising spending with a breakdown for 13 countries. It also includes a breakout of social media ad spending by mobile and desktop for all 13 countries.