Facebook is planning to poke a few more holes in its advertising walled garden.

The company, which shares little detailed data to help marketers track their campaigns, has told measurement and other ad-tech firms that it will start to release more. For example, it will let marketers track the order in which users see their ads and how many ads were viewed in a campaign. Facebook officials have recently talked to Adobe, Kochava, Nanigans and one other firm about the move in the past month, according to two people briefed on the matter.