Hails. Perhaps a dumb question, but anyway - To add other players (not FB Friends, just random others you come across in Battles etc) and to join a Guild, do you have to add the person as a Friend on your FB Profile?
Yes, you have to add them as a Facebook friend before you can add them to your Clan. Once they are in your Clan you can remove them from your Facebook profile and they will remain in your Clan.