meta-tags.html

  <!-- Google -->
  <meta name="description" content="">  <!-- Fill content with a description which will show in search results -->
  <meta name="keywords" content="">  <!-- Fill content with search terms -->
  <meta name="author" content="">  <!-- Fill content with your name -->
  <meta name="copyright" content="">
  <meta name="application-name" content="Personal Website">

  <!-- Facebook / LinkedIn-->
  <meta property="og:title" content=""/>  <!-- Fill content with the title which will show in bold when shared in messenger / news feed -->
  <meta property="og:type" content="article"/>
  <meta property="og:image" content=""/>  <!-- Fill content with an absolute link to an image which will show in messenger / news feed -->
  <meta property="og:url" content=""/>  <!-- Fill content with an absolute link -->
  <meta property="og:description" content=""/>  <!-- Fill content with a description which will show in messenger / news feed -->

  <!-- Twitter -->
  <meta name="twitter:title" content="">  <!-- Fill content with a title which will show in timeline -->
  <meta name="twitter:card" content="summary">
  <meta name="twitter:image" content="">  <!-- Fill content with an absolute link which will show in timeline -->
  <meta name="twitter:description" content="">  <!-- Fill content with a description which will show in timeline -->

Include this within the head tags on a webpage

Validate using:
• Google - https://www.google.com/webmasters/tools/submit-url
• Facebook - https://developers.facebook.com/tools/debug/sharing/
• Twitter - https://cards-dev.twitter.com/validator
• General check - http://socialdebug.com/