The W3C validation shows an [Invalid] Markup error when validating a page using the most recent version of the “gigya-socialize-for-wordpress” WordPress plug-in.
Bad value for attribute media on element link: Media query ended prematurely
The error should be simple enough to fix.
The error is located in the gs-for-wordpress.php file, below the section commented as:
* Outputs the gigya script link to the blog header. Using this instead of wp_enqueue_script because the gigya script
* doesn’t like getting called with a version parameter like WordPres appends.