Facebook is finally giving advertisers control over where their Sponsored Stories appear on the social network.

Previously, you weren’t able to choose where your ads were shown or receive any details regarding placement performance. Now, you’re able to specify your placement, including a mobile-only option.

The full list looks like this: All placements, which include right-hand side and the News Feed on both desktop and mobile, All desktop placements, News Feed, News Feed desktop, and News Feed mobile.

According to the network equipment firm Sandvine, 50 percent of the world’s smartphones are connecting to Facebook every hour of the day. By offering mobile-only ad placements, Facebook is providing app developers with a huge targeting opportunity.

Until today, the mobile experience has been relatively ad-free, so the success of this model is still unknown. We suggest experimenting with different ad variations to determine which placement has the best performance.

Mobile or desktop News Feed placement can be purchased through Facebook’s API and Power Editor, but not its self-serve ad dashboard.

[Via: Mashable, Image credit: Casey Fleser]