title: Select posts from users which are followed
body: <p>I have spent hours and still couldn't able to do it correctly. I have user table, and posts table.</p>
  
  <p><strong>User table</strong></p>
  
  <pre><code>username | followers        | following
  
  john     | mary,steven,joel | anthony,matthew
  </code></pre>
  
  <p><strong>Posts table</strong></p>
  
  <pre><code>fromuser | post                    | date 
  
  mary     | Bla bla, today is cold. | 1475982647
  </code></pre>
  
  <p>I need to get posts from the users who are being followed. Tried this;</p>
  
  <pre><code>SELECT * FROM posts WHERE $member[nick] 
  IN (SELECT followers FROM users WHERE $member[nick] IN followers ORDER BY id DESC limit 10
  </code></pre>
  
  <p>This doesn't return any posts. What is the correct way to do it ?</p>