GT: BigstickToucan
My old Bungie.net account was created February 6, 2008. Unfortunately, I had signed up using my brother's email account (we then shared an Xbox Live account which was linked to my old Bungie.net account), and he changed the password, meaning I couldn't log in. Thus is why I have this account.
If the clan system from Halo 2 came back, yes, but only with people in your clan. If it is just random people you are playing with, no.