15. The computer-implemented method for building a user profile of claim 14 , further comprising: mining user data from at least one of a Web page, a uniform resource locator, a natural language document, a network address, an Internet Protocol address, and a database; combining the mined user data with the collected user profiles; and creating a user mart of the combined mined user data and the collected user profiles to tie domains together and track user activity.
14. The computer-implemented method for building a user profile of claim 12 , further comprising: collecting a number of user profiles to build a group of related users based upon the user profiles; and building an audience profile based upon the group of related users.