The Power of Behavioural Ads in social networking websites such as Facebook, myspace, twittr, and jaiku.
(Facebook adds that they wont sell any data, or share it. WSJ)

There are 6 potential layers of creative data intelligence that can make online advertising more useful to online consumers.

1. Contextual data: What content is the advertising next to? (environmental contextual ads)
2. Demographic data: Who is viewing the advertising? (IP lookup, browser language)
3. Behavioral data: What websites has the user visited and what ads has he clicked on recently? (during last minutes, hours, days)
4. Consumer choice: What types of advertisements has the user explicitly expressed interest in? (time spent, action made)
5. Relationship data: What do we know about the user’s friends that can enable us to better target the advertising? (msn messenger, connectivity,chat, emails history)
6. Collaborative/predictive filtering: What does multivariable regression analysis of the targeting data available tell us that the consumer may want to view? (example after checking his bank account, here goes loan ads)

Facebook.com has a great backend application that stands for viral action towards users behavior.
So you want to
face your fears
face your demons
face your yourself
face your enemies
face your mother
face your parents
face your friends
face your manager
face your baby
face your games?

“It’s an invaluable tool when it comes to peer-to-peer marketing,” says Michele Neff, a CIA spokeswoman.

Facebook’s privacy policy states that outside companies sponsoring groups don’t have access to personal information or profiles. However, it does say that information may be shared with “other companies, lawyers, agents or government agencies,” in order to comply with the law.

Check out this new coming Arabic Facebook site from http://www.listenarabic.com/fb/ .