Twitter's Global Ad Revenues, 2011-2015 [CHART]

eMarketer has raised its forecast for advertising spending on Twitter for 2013 and 2014, estimating the company will earn $582.8 million in global ad revenue in 2013 before nearing $1 billion next year.

According to the new forecast, more than half of Twitter’s ad revenues—about 53%—will come from mobile advertising this year, up from virtually no ad revenue from mobile in 2011. Read the rest at eMarketer.