If you're thinking of creating a "social network" or a site where users can create content the views module is a must. You certainly want the users to have a profile page and most likely you want to customize the content on that profile page. In this tutorial I am using Panels 3, views and the tracker module so that users visiting a profile can see the content the user have created.
First I'm gonna activate the tracker module and then enable the tracker-view that comes with the views module.