CB radio
It was huge and kept growing by leaps and bounds.
Until it didn’t.
(My license was KFV2338, a number I haven’t said out loud in 40 years).
CB radio took off because human beings desperately want to connect with people they know and be heard by people they don’t.
And then it went away because it was noisy, unfiltered and sort of pointless.
We can’t imagine why people were so entranced.
Until the next one comes along.