Re: The 1920s onwards
"However he made a significant contribution to sci-fi in 1909 with the short story "The Machine Stops". An uncanny prediction of the social effects of the World Wide Web."
Radio4 made a stonkingly good adaptation of that story.
On the same lines folk should read "The Shockwave Rider" by John Brunner - his vision from 1973 about how our lives would be online, and we'd run our lives from our mobile phones, was really quite prescient. It's a shame he died in such obscurity.