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If you're on Facebook, you can access this open group called "The History Of American Television." It offers bite-size (and byte-size) glimpses back into the earlier days of the medium, with plentiful pictures and short bits of text to look back at one of the most influential mediums of all time.
A tremendous timewaster if you're into that sort of thing. (And no, there's no comparable FB History of Canadian Television page. I checked!)
The History of American Television