Twitter will earn $129.7m in mobile advertising revenues in 2012, nearly double the amount than Facebook.

That’s according to a new set of predictions from eMarketer which forecasted that Facebook, having just rolled out mobile ads for the first time this year, will take home only $72.7m in the US.

However, both companies will gross far less mobile revenue than other mobile ad platforms such as Google ($750m) and Pandora ($120m), said the report.

The market research group believes the increasing focus on mobile by both Twitter and Facebook, as well as a number of other digital advertising publishers, will contribute to growth in the overall US mobile ad market, which is expected to reach $2.61bn in 2012.

Tight integration between the company’s ad products, such as Promoted Tweets, and user experience has contributed to the shift towards mobile ads, said the report.

Facebook, by comparison, only rolled out Premium advertisements in the newsfeed at the start of this year but eMarketer estimated that next year, Facebook will beat Twitter by a significant margin to take $387m in mobile.

“By 2014, Facebook’s US mobile revenues will reach $629.4 million, compared to $444.1 million at Twitter—making Facebook the second-highest mobile ad earner of all companies after Google, which has a significant lead,” said the report.