I logged on to many bulletin boards in the mid-80's. Many of them were linked via FidoNet, and the chat on them looked remarkably similar to this forum and others like it.
I used an acoustic coupler working at 110 baud on a Acorn Atom, which used a motorala 6502 processor. I later built a floppy drive controller for it that allowed me to use Single Sided, Single Density 5.25" floppies to store 180K of programs or data.
It was not the first computer I ever loved. That distinction fell to an IBM 1130 that belonged to the Halton Board of Education in 1973.