When Facebook made the shift from “friend pages” to groups and fan pages, it created some frustration for those who are administrators. If you are an admin of one of these pages, you know that it’s great to gather and gain new fans, and to share your content with them. However, if you are “liked” by a fan who you would like to remove, there isn’t a way to easily remove them.
In what just may be Facebook’s biggest flaw, they offer no way for page administrators to mass admin their fans and followers.