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

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.