I don't have a lot of time, so I'll just type this quickly and whatever comes out is what y'all get.

In the early 1980s our company ran on a couple of ancient 8-inch-floppy disk (yes, 8-inch) computers. They later added an Apple IIc to the arsenal, on which I eventually learned how to do basic things on the VisiCalc spreadsheet application. I thought that was the coolest thing ever, and by around 1985 I was ready to get my own computer for home. The two really popular ones for home then were Apple and Commodore, and a co-worker advised me to get the Commodore because at that time there was a lot more fun stuff to do on it, and they'd just expanded the 64 to a whopping 128 megabytes! So I did, and wiithin a few months I had a ton of programs, I'd joined a user group, and through them I eventually was inspired to get my first dialup modem and get online with a few local BBSes.
I went for the "fast" modem -- the 1200 baud instead of the 300 that most people still had -- and instantly loved the fact that I was communicating with the outside world. I soon decided to go all out and get the disk and join QuantumLink which was later to become America Online but was strictly for the Commodore platform then. That's where I experienced my first chat rooms. Jumping ahead a bit, this part is hard to believe but it wasn't until five or six years later that I was finally ready to get my first PC -- a primitive desktop Hewlett Packard 386 at Costco. (But it came with a color VGA monitor!) That machine ran best on plain old DOS, which I really loved learning about, but it eventually opened up the world of Windows (3.1?) and the various expanded implementations of America Online which was finally becoming known as AOL.
So, I was on AOL (their earlier platform, and eventually "WAOL - Windows AOL") where I worked for a while as one of the "hosts" of a help forum. I later added Prodigy to my online adventures, and then Delphi, but I never got around to trying - or rather paying for - CompuServe.
In early 1993 they were on the cusp of making the Internet a public thing, which was very very exciting to me. It took a while for local providers to come into being, but I finally got one and graduated to a zippy 14,000-baud modem. I discovered Usenet, which was a zoo, as BK describes, but I didn't spend much time on it because I was influenced by a few friends to join a NYC-based BBS called "Echo", a text-only Unix-based conferencing system that back then was quite full of cool people who loved living on this exciting edge of technology. It was modeled on The Well in the Bay Area, for anyone who was familiar with that. Echo still exists, but with very few members -- of which I am still one.
That sort of summarizes the early history, as I experienced it, and of course this is a very condensed version of even my share of it. I guess it was sometime in the early 2000s that whatever computer I had was finally halfway decent enough to really experience the online world. I'm still on Windows-based computers because I know the territory, but when this current laptop dies I'm going to a Mac to both simplify the laptop aspect of my life and to better use musical applications.
I still have the Commodore computer and all the accessories and software I'd acquired. It absolutely warms my heart to occasionally look over that stuff, and I am so glad I kept it - and in good condition - through the years. It will eventually be time to get rid of it, hopefully to someone who wants to keep it intact, because it's an amazing little museum piece in and of itself.