TweakTown discusses filesharing, you can read it over here.
Those eight little letters, spawned into a web for the entire world, connecting everyone together instantly, forming entirely new paths of business, communication, research, ways to make money: a virtually unlimited and ever-expanding entity. The Internet is like the Big Bang Theory - an explosion and a continuation of an expansion.
This expansion lead to file-sharing, where in the 80s, Usenet (or newsgroups) and Bulletin Boards were used to not only have open, or closed discussion, but a form of file transfer. Usenet was the precursor to Internet forums we all frequent today. It was, and still is, more of an "underground" thing.