Research firm eMarketer has published its latest estimates for the global mobile advertising market, claiming that spending rose 105% to $17.96bn in 2013, and predicting a further rise of 75.1% to $31.45bn in 2014. It also claims that music service Pandora was the fourth-largest mobile advertising business in the world last year, accounting for 2.1% of global spending – a figure that doesn’t include tablet ads, or messaging advertising. That put it behind Twitter (2.4%), Facebook (17.5%) and Google (49.3%) in terms of market share. “Facebook in particular is gaining significant market share. In 2012, the social network accounted for just 5.4% of the global advertising market. In 2013, that share increased to 17.5%, and eMarketer predicts it will rise again this year to 21.7%,” explains eMarketer. Pandora’s own figures show it earned $366.3m from mobile advertising in 2013, up 69% year-on-year.