title: Wordpress WP_Query tricks to avoid duplicated posts
body: <p>I'd like to implement infinite posts functionality using <code>WP_Query</code> function.
  There are two divs in page.</p>
  
  <p>When you scroll down to the bottom every div loads more its own posts like newest or its own categories posts.</p>
  
  <p>But I don't want to load duplicated posts (i.e., if you load newest posts in div1, while div 2 load posts by category, some posts could be loaded in two divs).</p>
  
  <p>How can I avoid this?</p>
  
  <p>Any help would be appreciated. </p>