Up now on PCWorld.com is a slideshow (created by yours truly) to celebrate these anniversaries by examining the world of computerized social networking in the pre-Web era. It covers the usual suspects like Usenet, CompuServe, and BBSes, plus some surprising early services of which you may not have heard. I hope you enjoy it.
As a side note, I'd like to add that this will be my last slideshow edited by Ed Albro, my long-time PC World editor whom I have worked with since 2008. It's been a pleasure working with Ed, and I wish him all the best in his future endeavors.