He thought of an interconnected world. He called it réseau ("network" or, arguably, "web").
He created a sophisticated hyperlink system (pre-HTML).Publish Post
He created a rudimentary (but impressive) book index (pre-Google Books).
He created a (fee-based) search engine (pre-Google Search).
He thought of a social network, where users would "participate, applaud, give ovations, sing in the chorus" (pre-Facebook).
All that ... in 1934.
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The Web Time Forgot