Spending on geotargeted display advertising is currently small—but growing rapidly. BIA/Kelsey estimated advertisers in the US would invest $725 million in local mobile display advertising in 2013, which is nearly twice the amount spent last year. Looking ahead to 2017, the research firm forecast total expenditures would more than triple over the next four years, to over $2.74 billion, as more national brands realign strategies to sync up with the increased use of mobile devices. In addition, as brands learn (through testing) how best to leverage the location tracking capabilities of smartphones and tablets, spending is expected to rise. Read the rest at eMarketer.