Mobile ads awaiting a medium; ON ADVERTISING – May 5, 2008 Monday – ContentAgenda.com
EMarketer says overall mobile ad spending will rise to more than $19 billion by 2012. The Mobile Marketing Association, a trade group, says it should account for about 5 percent of ad spending worldwide by 2013. Given that the global ad market totals about $500 billion, that means about $25 billion would be allocated to cellphones.

Excellent article, en anglais, autour de la publicité sur les mobiles.