Another reason facebook fan-addicts might join such pages is because the fan page may contain a humorous picture. However, most of these pages on facebook require that a user first become a fan in order to see the content. Human curiosity will take over the fan-addict, so they will almost inevitably join the fan page in order to see the content.
A facebook fan-addict is easy to spot. On a regular user's account, a notification will appear once a friend has joined a group. If that particular friend has become a fan of a page, "along with 38 other profiles", then that friend is most likely a facebook fan-addict.
There are no known cures for facebook fan-addiction. The best a fan-addict can do is join enough pages to the point where facebook will not let them become a fan of anymore pages. The current limit for fan pages that a single user can have is around 2000. After that, a fan-addict faces 2 difficult choices: give up becoming a fan of pages, or remove themselves from some of their fan pages in order to make room to become a fan of other pages.
Joe: "I heard Bill has become a facebook fan-addict. All he does now is stay up in his room searching through facebook for pages he can become a fan of."