This is the magic of broadcast media oligopolies. There was a co-presence signal, but it had a 12-24 hour delay. It was called "the water cooler." You quickly

This is the magic of broadcast media oligopolies. There was a co-presence signal, but it had a 12-24 hour delay. It was called "the water cooler." You quickly learned what everyone else was watching and if you had picked the wrong network for that timeslots.