Note: OG goes in the head where as with Schema the language is called out in the head but the tags are in the body.
Facebook - in the open graph social page about a year of so ago said they did not like the data in the page. The devlopment guy said he abandoned it be cause webdesigneers often wiped out the tags at some point on large site and it was too hard to maintain. There was some very interesting debates amongst people far above my level of education and understanding. I recognized many of them from my research the last 3 years in to the code development of open source.