Automatically generate a short description of a page when a user posts a link On facebook, google plus and similar websites, when someone posts a link, the thumbnail and short description of the page is automatically generated. See the screenshot below.

Is it possible to this in Drupal 7 ? If yes, how? Is there any module for it?
Look at the source for that page, you'll see this 

&lt;meta name='description' content='In honor of Wolfenstein 3D&amp;#039;s 20th anniversary, the game will be released for free to play in browser today.'/&gt;


Should be fairly straightforward to grab that!