Nielsen partners with Facebook

Nielsen, the company that collects data on, well, everything it seems, and Facebook, the ubiquitous social networking site, announced a multi-year partnership this morning that will let Nielsen tap the “consumer reach” of the social network. “Dubbed BrandLift, it will launch in the U.S. with select test partners this week and will be rolled out to all Facebook advertisers in the coming months,” according to MediaPost . “They said the research utilizes ‘opt-in’ po…