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I would like to know if the opengraph markup is W3C valid,
I’m getting the following error when I try to validate it:
Line 14, Column 17: there is no attribute "PROPERTY"
<meta property="og:site_name" content="sitename">
In case it’s not valid, will it impact my pagerank and other search engines algo?
Is it possible to cloak those properties?
It’s not valid in the normal HTML doctypes, but there is a doctype you can use to validate XHTML documents including Open Graph:
See this question: Html validation error for property attribute