added more tags

                'og:image',
                'article:author',
                'article:publisher',
                'og:type',
                'og:site_name',
                'og:locale',
                'article:tag',
                'article:section',
                'fb:admins',
                'fb:app_id',
                'twitter:card',
                'twitter:site',
                'twitter:domain',
                'twitter:creator',
                'twitter:image:src',
                'twitter:description'
    removed leading spaces
    removed extra new line at the end
    @fortasse helped a lot with these changes