Do You Have to Join a Group That Your Friend Invites You To?

If your friend invites you to a group, do you have to join? Edit this page and add your thoughts.
*Nah, he probably invited a bunch of people, and won't even realize if you join or not.
*If it's a group that the friend personally created, or one of their friends, then they will notice if you don't join.
Category:Facebook Etiquette
Category: Groups