Under a long-rumored transaction, Facebook will purchase the Atlas Advertiser Suite, an ad management and measurement platform that Microsoft took on with its $6.3 billion acquisition of digital ad agency aQuantive in 2007. Facebook did not say how much it paid for the technology.

Unable to make it work for its own purposes, Microsoft wrote off $6.2 billion of the aQuantive deal's value last year.

Facebook has long been dogged by doubts about the effectiveness of its ads, and was embarrassed just days before its initial public offering in May when General Motors Co declared it was pulling the plug on all paid advertising on Facebook's network.

Since then, Facebook has introduced a number of tools and partnerships to prove to marketers that advertising on its social network delivers enough bang for the buck.

Google leads the $15 billion US market for online display ads with 15.4 percent share, according to researcher eMarketer, followed by Facebook with 14.4 percent.