Yeah, that's a very interesting observation. I'm trying to think of pre-internet means of doing that... You can't really observe without being observed in the absence of a broadcast mechanism. You're just the weird person in the back who shows up but doesn't talk to anyone.
Might actually be a genuinely novel mode of interaction (if we can really call it "interaction").
Might actually be a genuinely novel mode of interaction (if we can really call it "interaction").