title: Appending a single 0 (zero) to end of URLs, when facebook.com is the referrer
body: <p>I need to append a 0 (zero) to the end of each of my URLs when visitors click in from facebook.com.</p>
  
  <p>I was able to get this working by using this in my .htaccess:</p>
  
  <pre><code>RewriteEngine On
  RewriteCond %{HTTP_REFERER} ^http://(www\.)?facebook\.com [NC]
  RewriteCond %{QUERY_STRING} ^$
  RewriteRule . %{REQUEST_URI}?id=FB [R=301,L]
  </code></pre>
  
  <p>The problem is, I don't want to use a question mark, and when trying this below code in my .htaccess, the URL is destroyed (I get several zeros instead of just the one).</p>
  
  <pre><code>RewriteEngine On
  RewriteCond %{HTTP_REFERER} ^http://(www\.)?facebook\.com [NC]
  RewriteCond %{QUERY_STRING} ^$
  RewriteRule . %{REQUEST_URI}0 [R=301,L]
  </code></pre>
  
  <p>Is it posible to append just the single zero to the end of my URLs using this method? Thanks for any guidance.</p>