title: What is Youtube comment system sorting / ranking algorithm?
body: <p>Youtube provides two sorting options: Newest first and Top comments. The "Newest first" is pretty simple that we just sort the comments by their post date. But the "Top comments" seems to be a lot more complex than just sorting by "thumb up"s.</p>
  
  <p><img src="https://i.stack.imgur.com/0wiYP.png" alt="Youtube comment system"></p>
  
  <p>After a short research, I found out that the order of comments depends on those things:</p>
  
  <ul>
  <li>Number of "thumb up"s and "thumb down"s</li>
  <li>Post date</li>
  <li>Number of replies to that comment</li>
  </ul>
  
  <p>But I don't know how Youtube uses this information to decide the order, like what information is more important and what is less important.</p>
  
  <p>Is there any article about this topic that I could refer to?</p>
  
  <p>Thanks!</p>