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At home it was 28.8k dial-up (but my PC came without a modem, or a sound card or CD drive come to think of it, so I installed one myself), and Compuserve from 1993. Before that, dial-up BBS run by a hobbyist. Compuserve was great and the discussion forums in particular were fun, not unlike Lemmy.
At work, X400 email on a DOS PC. That was maybe around the very end of the '80s or early '90s. It seemed like science fiction, and very few people in business had email at the time so it wasn’t really very useful.
I really love WFMU in New Jersey. Of course they broadcast on FM, but they have four live streams (I especially like the ‘Give the Drummer Radio’ stream https://wfmu.org/drummer). Take a look at the schedules - you’ll find lots of music that you won’t hear on mainstream radio, across a wide range of different genres, and all of it is archived so you can listen to past shows and see the playlists for each one. It’s listener supported, so there are no adverts except for their own WFMU fund raising. My favourite shows: