Update: The CMAs have released an official statement via E! News explaining the deleted social post, which is below. It does not mention any tweets:
CMA has not erased any mentions of Beyonce’s performance on the CMA Awards. In advance of the broadcast, CMA removed a five-second promotional clip from ABC.com and CMA’s Facebook page. The promo was unapproved and CMA removed it prior to the broadcast. Beyonce’s performance with Dixie Chicks was a highlight of the evening and we are continuing to share the amazing full-length performance clip via our official social channels.
Full update below the original story.