Users of Facebook`s apps for Android, iPad and iPhone may begin seeing ads as soon as early March, as the company looks to gain an addition revenue source before it goes public.

Sources close to the matter say Facebook has already discussed proposals with advertising agencies, according to the Financial Times. Facebook began running sponsored stories in December 2011. Featured stories will appear in the mobile news feed — similar to Twitter`s promoted tweets; mixed in with posts from your friends.

In Facebook`s paperwork for its Initial Public Offering, filed Feb. 1, the company pointed to mobile as a potential revenue source and warned that the lack of mobile revenue was one of the things that could harm it. Nearly half of Facebook’s 845 million users access the site via mobile device.

One source told FT Facebook would incentivize advertisers to link within Facebook, rather than directing users off-site.
Facebook will hold an event for marketers in New York Feb. 29, so we can expect announcements of new ways they can use the social network. Facebook is yet to unveil Timeline brand pages, although that move is anticipated in coming weeks as Facebook rolls out Timeline for all users.