Opengraph W3C valid ?

Posted by mnml on Stack Overflow See other posts from Stack Overflow or by mnml
Published on 2010-05-14T12:33:44Z Indexed on 2010/05/14 12:44 UTC
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html

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opengraph

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w3c

Hi, 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?

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