Like many things in fandom, I guess I'm ridiculously late on this--like, about half a decade late--but after quite unintentionally stumbling upon
charlottelennox's
The Ms. Scribe Story: An Unauthorized Fandom Biography, I found myself spending two days doing literally nothing else but reading it.
It's a jaw-dropping exposé of one of the most fascinating people in the Harry Potter fandom who from about 2003-2006 created a bunch of sockpuppet journals, trolled like a pro, and it seems single-handedly propelled herself into BNF status.
charlottelennox has an amusing, wry writing style that had me hooked. And talk about in-depth--this is one of the most meticulously-researched things I've ever read.
Highly recommended, and if nothing else, it's a fascinating insight into the HP fandom before I joined. :)
(Beware: it may make you kind of paranoid...)