For Those in Fandom...

 Everyone who participates in fandom, no matter if they do it casually or religiously and no matter if their fandom is big or small, should read this article.

And maybe its follow-up too, for completeness.

The author principally focuses on Harry Potter, but these same ideas can be said to apply to every fandom everywhere, so no matter if you're in Harry Potter fandom or not, you should read it.