I did not know this until just a little while ago, when curiosity led this cat by the hand:
Sandwiched neatly in the middle of SIYE's birthday season (Harry, JKR and Ginny) is the SIYE's very own fete. This past August 3rd was our site's 15th birthday!
The site marked it's first operational day with several dozen pre-approved stories, which I shall not list in full, but the industrious amongst you can probably find.
The very first story, the mythical story #1, has been deleted, and its identity may have been lost to the ravages of time. However, for historical purposes, I will list story #2:
Can't Stop Loving You by LaArpista
which will never qualify for Martin's gems because it was left incomplete after 12 chapters. The distinction of first completed story that we have on file, therefore, is story #3:
My Best Guarded Secret by Amanda SaturnVenus
Fifteen years is an eternity in the era of the internet. Congratulations to those who came before and gave us what we have; appreciations to those to picking up the oft-handed torch to keep the community thriving for another generation!