I understand why Facebook might want to claim this in public, but don't call people 'fabricator', okay? You never know when someone might just have conclusive evidence that proves you wrong.
Don't get me wrong, I admire Facebook for making Thrift public, and it was a great thing for the internet. It was probably foolish of me to focus on the lineage of the thing.
Also, I must plead ignorance. I've never worked with ASN.1 or these other formats. From my cursory examination, ASN.1 seems to be far more complex.