Bungie's servers, initially group everyone together locally. Unless, you set up your own fireteams. Meaning, all you wonderful bastards. Are in the Tower, but you can only interact, or see players local to the server group you belong to online. Hopefully, I'm not the only person to experience this phenomenon. Mainly, when waiting to meet up with a friend, or family member. However, more noticeable when your separated from your fireteam, an explaining where your currently located in the Tower. : )