San Francisco-based PageLever, a developer of advertising analytics tools for Facebook, has been acquired by Unified. Financial details of the buy were not disclosed. Both of the firms are Facebook Preferred Marketing Developer, developing applications around Facebook's social advertising. Unified said the buy would give it access to PageLever's Facebook News Feed product and other social advertising technology. PageLever was founded by Jeff Widman and David Turner; the firm's employees are all joining Unified.