That's Roger Ebert's theory, at any rate. He says so on his blog. Link via Test Pattern.
Roger Ebert's Journal: Fanzines beget blogs: "Fanzines were mimeographed magazines that were circulated by mail among science fiction fans in the days before the internet. They still are, for all I know, although now they're generated by computer printers. I first learned about them in a 1950s issue of Amazing Stories and eagerly sent away 10 or 20 cents to Buck and Juanita Coulson in Indiana, whose Yandro was one of the best and longest-running of them all. Overnight, I was a fan, although not yet a BNF (big name fan). It was a thrill for me to have a LOC (letter of comment) published on such issues as the demise of BEMs (bug-eyed monsters), and soon I was publishing my own fanzine, named Stymie."