IBM, co-owner of Prodigy, seems to have been ahead of the curve, pushing online services as early as 1990
we're a year out from September 1993 here folks
notably Promenade was a little known service from Quantum Computer Services made specifically for the IBM PS/1 👀
instant messaging!
https://www.technologizer.com/2010/05/24/aol-anniversary/
... it appears Promenade was absorbed into AOL not long after this 🙃