Nick Paumgarten in The New Yorker:
In the fall of 1964, on a visit to the World’s Fair, in Queens, Lewis Altfest, a twenty-five-year-old accountant, came upon an open-air display called the Parker Pen Pavilion, where a giant computer clicked and whirred at the job of selecting foreign pen pals for curious pavilion visitors. You filled out a questionnaire, fed it into the machine, and almost instantly received a card with the name and address of a like-minded participant in some far-flung locale—your ideal match. Altfest thought this was pretty nifty. He called up his friend Robert Ross, a programmer at I.B.M., and they began considering ways to adapt this approach to find matches closer to home. They’d heard about some students at Harvard who’d come up with a program called Operation Match, which used a computer to find dates for people. A year later, Altfest and Ross had a prototype, which they called Project TACT, an acronym for Technical Automated Compatibility Testing—New York City’s first computer-dating service.