I'm having dns problems with websites hosted on cloudflare and have been since about 12am cst last night. There's more stuff going down than just facebook it seems it's just sporadic which sites are affected and which aren't most likely it differs between regions.
Any device with a facebook app, and any webpage with a facebook plugin has been hammering DNS servers with DNS requests for resolutions that are no longer available because facebook has gone dark. It is a knock-on effect
I was looking into this too and can confirm your description sounds accurate
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