title: How to implement facebook and g+ like link previews with client side languages
body: <p>What the real coding involved in making these link previews..means which languages? How can we extract meta tag information in a website. I know these all requires AJAX but I want a bit more clarification to make it for my website !!!</p>
  
  <p>And one more important doubt is can I do it by just using client side languages like extracting meta tag dynamically by javascript function?</p>