The longform Buzzfeed piece “Alt-White: How The Breitbart Machine Laundered Racist Hate” has lots of insider baseball stuff (via leaked emails) involving Milo Yiannopoulos and his inner circle.
Much of it involves the sausage-making aspects of BNN meme creation circa 2015-16, along with the associated obsessions with branding, vulnerable egos, and other miscellaneous vanities.
There is the small revelation that Milo did (and perhaps still does) have some peripheral contacts with race-conscious Alt-Right types.