Evidon provides reports to different types of companies that give them information about what trackers appear where, how prevalent they are and/or whether they're in compliance with privacy laws. High-level reports, not "your data."
pokoleo forgot to mention that 1. GhostRank, the feedback feature of Ghostery, is very explicitly opt-in: no data is collected unless you enable it, and 2. We anonymize all of the data that's collected. We have no interest in tracking individual GhostRank users. What's interesting to us is being able to say "This tracker appears on the most websites, or causes the biggest slow-down of a page load on average."
The wikipedia article[1] of Ghostery gives a quick & fast overview of what they do. MIT Technology review posted[2]:
> Evidon sells two main services based on the data it collects. One allows website operators to see which tracking code, from which companies, is active on their site and how it affects the speed with which its pages load. The other provides ad companies with figures on how common the tracking code from different companies is around the Web.
Sadly, that article is full of shit. And I'll edit our entry later to remove the Criticism, which is only partly correct.
GhostRank is explicitly for collecting tracker information, and in no way does it allow an advertiser (tho most of the customers are publishers) to somehow improve their targeting.
