The internet has been around since the late 70's.
Just most people didn't know it existed until the mid to late 90's.
http://www.webopedia.com/quick_ref/timeline.asp
I also did lunch time radio back in the early 90's. Was cool blasting the latest in thrash & death metal to the dismay of most teachers, but surprisingly our show was never axed.
The internet back then was all BBS services, no World Wide Web, etc and not like the internet everyone nows today though, our school didn't have bulletin board access or anything until well after I left in 1988.
We got away with a lot with our programming on the school radio station as well, we would get other students to hand in tapes, vinyl or CD's of theirs (mostly tapes and vinyl though back then LOL), some of the kids would request some pretty strange tracks,especially the year 11 and 12 ones.
I think only time we got censored was when one of our 'guests' dropped the 'c' word on-air
Great times though, unfortunately the year after most of us left some younger students tried to continue it and came back from the first lot of school holidays to find the cables, etc had been cut, probably by the new hardline principal that was there at the time