Facebook began offering advertisers using its sponsored stories a new metric to help them analyze their campaigns: average news feed position.

22squared Senior Digital Strategist Justin Oh tipped off sister blog Inside Facebook about the launch of the average news feed position metric, which was first discussed with Facebook Preferred Marketing Developers in June, but did not appear on the social network’s ads application-programming interface until late last week.

Inside Facebook pointed out that while the new metric will allow advertisers to see separate news feed data for each placement, desktop and mobile are not broken out.

Screen shot courtesy of Justin Oh, via Inside Facebook.