LOTAME

LOTAME is an online social media ad network. Uses various technologies to track user patterns across social media, adjusting ad targeting settings accordingly. NAI member.

From the website:

Lotame aggregates data unique to the social web allowing our participating brands to locate, target, and message the sought after influencers inside these communities. According to independent studies these influencers are worth 8 times more than a non-influencer.

Wow. 8 times more. That's more than double! What do they have to say about publishers?

Lotame's technology, called Crowd Control, enables you to research deeper into your knowledge about your site's users. Obtain a comprehensive view of your user's actions and interests (declared and demonstrated) within your site allowing you to discover and leverage new marketing channels. In addition, Crowd Control provides you with real-time reporting on your impressions received and your expected revenue.

So who the hell are these influencers, and how much would it cost to buy one? Oh yes, I forgot, top Diggers and Redditers and whatnot have already sold their profiles on eBay.

UPDATE

Service is no longer available. Instead, here is more information about them, from the website:

We offer a Data Management Platform (DMP) that helps publishers and marketers derive value from their first-party data assets and gain additional insights from third-party data without compromising on quality, security and user privacy. We are a seasoned group of professionals that have developed one of the best, if not the best, pieces of technology to navigate the challenges of the very complicated, fast moving data ecosystem and we are making a change to our business that in no way alters our strategic mission to be a true partner and develop technology that drives results that our clients desire and deserve.

Be that as it may, visit LOTAME