Give a store your e-mail address, it'll find you on Facebook
Facebook wrote up a post on Sunday attempting to explain some of its new approaches to selling and analyzing ads on the site, responding to user alarm about its partnership with data firm Datalogix. Among the revelations: stores can give Facebook hashed versions of customer e-mail addresses they've collected to target users with ads, and Facebook is allowing users to opt out of entire ad networks via a link in real-time ads.
Facebook's recent partnership with Datalogix meant that it would be sharing data on ad viewership and how customers reacted to ad displays. Datalogix plans to forward Facebook's data to clients like CVS and Stop and Shop to help them determine how effective the ads are. In turn, Facebook promises that a combination of ID numbers and hashes protect users, and that data is only presented in aggregate to Datalogix clients.
