Abstract machines of faciality

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Can someone please explain to me Deleuze and Guattari's concept of "Abstract machines of Faciality" touched upon in A Thousand Plateaus?

I am reading an essay at the moment that mentions this concept in passing.

>Deleuze and Guattari have proposed an "abstract machine of faciality" that balances the signifiers (white wall) of the human face with its subjectivity (black hole). They assert that the 'face has a great future, but only if it is destroyed, dismanted,' and that faciality is ultimately a matter if the "body without organs, animated by various intensive movements" across a "face-landscape."

What the hell does that even mean?

Also while we are on the topic of these two fellas, does anybody know a good secondary work explaining the basic foundations of their philosophy? I intend to read work authored by them eventually but at the moment almost anything I've read of their's passes way over my head.