title: "Pin It" button source code (pinterest.com)
body: <p>Does anyone have idea about how to implement something like "PIN IT" button in pinterest.com?
  From a high-level, I understand what it does but not in detail. You click on "pin it" bookmark, and then you scrape the site source code to find out images with width and height greater than some threshold. The scraping of the page source to find images can happen on the client side or on the server side. What's the best way to achieve something similar?</p>
  
  <p>Could some one throw insight into their implementation?</p>