We are aware of ongoing issues with the JS SDK failing to load for sites using RequireJS. We are actively working on a fix and expect it to get pushed shortly. For more information, please subscribe to this bug - https://developers.facebook.com/bugs/173784386505038
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This issue has been resolved.
A fix has been deployed to production. If you are still experiencing issues with this they will clear up shortly.
We are rolling out a fix and expect it to land shortly.