Can Open Graph Protocol be validated by W3C Markup Validation Service ?

Hello,

In order to add use Facebook features I put some meta tags relative to Facebook (property, og) but when I try to validate my webpage http://www.agencearagon.com I go the following error:

Line 23, Column 16: there is no attribute "property"
<meta property="fb:admins" content="727013482" />

I've seen that these meta belong to the Open Grap Protocol (http://ogp.me/).

Does it mean that every page that intend to use Facebook features could not be validated ?

Thank you,
Fred