In September, Twitter bought mobile ad exchange network MoPub for around $300 million dollars. This move was clear indication that Twitter was focused on mobile revenue growth, with 75% of it's business already coming from mobile.
Today, an article in Advertising Age announced that advertisers on Twitter will be able to purchase ad space through MoPub in a private beta. MoPub's portfolio includes thousands of apps from Wordpress, to Open Table, and messaging app Tango. The ads will be placed as banners, interstitials, video and sometimes in native formats.