Spike the Dragon was curiously absent while the rest of his close pony friends were completely overrun by fans, haters, and critics of The Friendship Journal. Surely, some pony had to have commented on his written experiences, right?

Yes.

And that's the problem.
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This is a fan's interpretation of an event that takes place shortly after the episode "Fame and Misfortune" (allegedly written by M.A. Larson, though he's on record saying that he doesn't like it).
One-shot.