Impersonation scams are scams in which the scammers act as ArenaNet staff. NOTE: ArenaNet staff will never ask you for your username/password or demand free items. So if you do get asked for one of these and they claim to be a staff member, just ignore them. You should also report anyone impersonating ArenaNet staff to ArenaNet. Also note that on the rare occasion that ArenaNet staff are in game, their chat text appears in a special color in the conversation window, usually green or purple.