Daring Do, as most ponies knew, was a legendary adventurer-archeologist who spent her life going to places no sane pony would and recovering artifacts of immense power, all the while combating her archnemesis Ahuizotl and his seemingly endless legions of minions. Everypony also knew that her best-selling books were written by the mysterious, reclusive author named A.K. Yearling. The part nopony knew was that they were, in fact, one and the same pony - and very real.
Therefore, nopony felt bad about making their own additions to the ongoing, increasingly exciting but convoluted storyline. These stories would get posted on fan-based websites (the concepts of "computers" and "Internet" were quickly catching on), where fans would read, rate, review, and write. Daring Do was, at best, mildly aware of this "fanfiction", as it was called. She'd certainly never read any of it.
When she found a free day and decided to check it out, little did she know what she would find...

Rated only for reference to things, but nothing is shown in any detail whatsoever.