Since Facebook became a publicly traded company, one big issue investors have had concerns about revolved around making money off the mobile version of the company's site. According to Computer World, Facebook will be testing a new ad system for the mobile site and requesting app developers to assist with the beta test.
Facebook sees this as a way for mobile app developers to grow its mobile business and help developers reach a broader audience. With a recent finding that more Facebook users utilize the site from mobile devices than from browsers, the need for mobile advertising has increased greatly. Facebook sees this as a way to calm jittery investors concerned about revenue.