"On August 6, 1991, he [TBL] posted a short summary of the World Wide Web project on the alt.hypertext newsgroup. This date also marked the debut of the Web as a publicly available service on the Internet."
As the Wikipedia states, this was the point when hypertext was married to the Internet.
The original alt.hypertext posting is still available, thanks to Google Groups:
"The WWW project merges the techniques of information retrieval and hypertext to make an easy but powerful global information system."
Also note that Berners-Lee made available the first Web browser - "prototype (very alpha test) simple line mode browser" - and the first hypertext editor. For, you know, reading and writing on the Web ;-)