title: Request user to post on their facebook wall
body: <p>I have a merchandising web site that allows user to buy stuff on my web site. I want to integrate this feature with facebook and enable users to allow my site to post on their wall a message showing that they have purchased an item from my web site. </p>
  
  <p>How should I got about doing this. Do I need to create a facebook app to do this? Basically, I just want to enable users to accept my request to post a custom message on their walls.</p>