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Rather than use existing meta tag "name" attribute, OGP uses the RDFa "property" attribute, as well as prefixes property names with "og:" to give the appearance of RDFa:
<meta name="description" content="invisible description of the page"/>
<meta property="og:description" content="invisible description of the page"/>
(actual meta name from web legacy and OGP property from their spec)
Meta tags, no matter how well intentioned, are another form of invisible meta data, which are subject to all the same problems they've always been since meta keywords (DRY violation, rotting, spamming, etc.).
The RDFapologism of using a "property" attribute instead of a "name" attribute doesn't change this, nor does the "og:" syntactic vinegar prefix.
Use microformats to markup the visible information on the page instead.