• by Mark Walsh  @markfwal, June 5, 2012

At its fMC event in February, Facebook announced among other things that its sponsored story ads would appear in users’ mobile news feeds as well as on the desktop. But it didn’t allow for mobile-only or desktop-only buys. Today, Facebook said marketers will now be able to buy different placements for sponsored stories—ads that highlight when someone “likes” a brand or Web site, for instance--through its Ads API and Ads Power Editor tool.

This allows advertisers to run sponsored stories in the news feed on the desktop, on mobile, or both, as well as on the right side of the desktop feed.

“Facebook is always looking for ways to improve products and has responded to requests from marketers to control the placement of their sponsored stories. As companies are promoting services more frequently on mobile, this option gives them the opportunity to focus on specific placements that will impact them most directly,” the company said in a statement Tuesday.

The following are the various options Facebook is offering for sponsored stories:

-All placements: Right-hand side +News Feed desktop+ News Feed mobile

-All desktop placements: Right-hand side + News Feed desktop

-News Feed (desktop and mobile): News Feed desktop +   News Feed mobile

-News Feed desktop: News Feed desktop-only

-News Feed mobile: tNews Feed mobile-only