I was under the impression group membership is voluntary - that you can't add someone to a group, but rather you can invite them.I want to create a Facebook entity that:Is open to everyone - everyone can leave or join at willThe only one that can make use X be in the group is an action by user XWill be accessible to users that aren't signed to FacebookA group doesn't seem to follow rules 2 and 3. Should I use a Fan page ? Or ... what is the best Facebook entity to capture this?
Why can I add members to FB groups instead of just inviting them?
facebook
You don't want a group. You want a page.http://www.facebook.com/home.php?#!/help/?faq=16140Since groups look similar to Facebook  Pages, whats the difference between  them?Groups and Pages serve  different purposes on Facebook. Groups  are meant to foster group discussion  around a particular topic area while  Pages allow entities such as public  figures and organizations to broadcast  information to their fans. Only the  authorized representative of the  entity can run a Page.