protected static function macro_og( $tags, $content = null ) 
	{
		if ( !is_array( $tags ) )
		{
			$tags = array( $tags => $content );
		}
		
		$buffer = "";
		
		foreach( $tags as $key => $content )
		{
			$buffer .= '<meta property="og:'.$key.'" content="'.$content.'" />';
		}
		
		return $buffer;
	}