title: how to programmatically post a comment on Facebook post
body: <p>I am noob to Facebook api, let me explain this in more detail, I have gone through graph api, I am able to post a comment using correct access token via graph explorer, all works fine.</p>
  
  <p>my question is that I see a post on Facebook wall, I want my app to post a comment on this post, how does my app know the post_id of this post, are there any ways to get post id of latest post, or for last 10 posts or some other way.</p>
  
  <p>thanks in advance</p>