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If the issues is DNS-related or routing-related then since it's all owned by FB, they own the records too so it's likely that literally everything that has a DNS record under the FB cost code will be hit.

The WhatsApp servers will be sitting idle most likely!

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Leaving aside whether or not this is true, why would you apply DNS changes to all of your properties at once? Especially if it's a sensitive change?

Seems much more likely to me that WA/IG/Oculus somehow rely on facebook.com behind the scenes than that all FB domains were affected by a config change.

A misconfiguration of BGP would absolutely do it.

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