Facebook and Campaigns

Facebook, as you can see in this article, has joined with Acxiom which allows the social networking giant to match postal addresses, email addresses, phone numbers and user IDs (if they don't have them already).  In this way Facebook can sell ads to campaigns and reach you faster than mail and more or less ensure you will read it - as opposed to traditional mail.   This micro-targeting is being done by lots of firms, but none have the 1 billion names that Facebook has.
Here is Facebook's ad page for campaigns.

Below is a PBS story on what is meant by micro-targeting.