Per-page social media meta tags

• Check for C::i18n lang compat/overrides
• Facebook
  • og:image
  • fb:app_id
  • og:type
  • OpenGraph
  • Caching
    • Rules
    • Invalidate cache
  • Debug
• Twitter cards
  • Validator
• VK (uses FB/Twitter tags)
  • Invalidate cache
• Weibo

  <meta name="twitter:card" content="summary">
  <meta name="twitter:site" content="@User??????">
  <meta name="twitter:creator" content="@User">
  <meta name="og:title" content="WHY">
  <meta name="og:description" content="WHY DOES THIS EXIST">
  <meta name="twitter:image" content="">

Please provide additional active social media site metadata that should have core integration.