Square America is a web site devoted to American vernacular photography, found photos, and snapshots. In addition to a ton of great pix from the 1940s to the 70s, they are currently showing selections from a 56-image "pre-powerpoint IBM slide presentation with one foot in the future and the other stuck solidly in the 70s." There's no sound, so you'll have to imagine the tone telling you to move to the next slide, but the word "online" figures prominently. Click through for another couple of examples.
It's 1975 And This Man Is About To Show You The Future [Square America]