1981? Um, we were at it long before then. Mark T and I were doing it in 1977/78. And were by no means the first.
As for re-scheduling classes, or moving 'girls'... I call "rollocks", computers were not used for that in the early 80's. At best, schools had a PET or a Research Machines 380Z, not networked, (or an old ICL 2903 teletype link) and used in the fledgling CSE Computer Science course.
"later, as ... were learning to make free phone calls to the USA"... later? Again, we were doing that in 1978.