title: Working with Facebook like API and opengraph
body: <p>The Documentation from facebook isn't understandable, atleast for me. </p>
  
  <p>I have never worked before with facebook and had a basic requirement of putting a like button on Product pages. </p>
  
  <p>So yesterday, I added the OpenGraph meta tags and like button to my Product pages as stated in this documentation, <a href="https://developers.facebook.com/docs/opengraph/" rel="nofollow noreferrer">https://developers.facebook.com/docs/opengraph/</a>. I also created an app, as the document stated that it has extended the basic meta data to add a required field to connect your webpage with Facebook: <strong>fb:app_id</strong>.</p>
  
  <p>The like button has been set but i have few queries which are as following :-</p>
  
  <ol>
  <li><p>For some pages, the like button doesn't read the og tags. Rather than publishing the whole thing in a story manner by reading og tags, it just shows a link. During googling, I read it happens because of facebook caching and since, I shared the link on facebook before putting the meta-tags, this is happening. So, Is there any way that I can direct facebook to reset all the caching for my pages or scraping that it has done earlier.</p></li>
  <li><p>Though I have created the App, I actually have no idea what to do with it. Why is it needed and what matters it can help me with.</p></li>
  <li><p>I tested one of my URLs here: <a href="https://developers.facebook.com/tools/debug" rel="nofollow noreferrer">Facebook Linter</a> but it shows some error and stuff which i can't understand. Below is the image. Please tell if I have done anything wrong and why it's showing these errors</p></li>
  </ol>
  
  <p><img src="https://i.stack.imgur.com/1372Q.jpg" alt="enter image description here">  </p>