According to this post http://yoast.com/facebook-open-graph-protocol/
Within the opening <html> tag, the Facebook and Open Graph nameservers need to be included to tell your browser and other parsers that it can expect tags other than HTML:
The plugin doesn't do that.. Please confirm whether i have to manually do this step.
Also the plugin picks up multiple og:image which i don't want - how can i make it pick only the first image?