title: What's causing xd_arbiter.php to flood my access log?
body: <p>AWS alarm watch triggered and when I look into my access log, this is what goes on for miles and miles:</p>
  
  <pre><code>14.140.146.5 - - [27/Jul/2012:10:30:18 -0400] "GET /2009/08/05/asynchronous-procedure-execution/?fb_xd_fragment HTTP/1.1" 200 65182 "http://static.ak.facebook.com/connect/xd_arbiter.php?version=9" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; InfoPath.2; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)"
  14.140.146.5 - - [27/Jul/2012:10:30:20 -0400] "GET /2009/08/05/asynchronous-procedure-execution/?fb_xd_fragment HTTP/1.1" 200 65182 "http://static.ak.facebook.com/connect/xd_arbiter.php?version=9" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; InfoPath.2; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)"
  14.140.146.5 - - [27/Jul/2012:10:30:20 -0400] "GET /2009/08/05/asynchronous-procedure-execution/?fb_xd_fragment HTTP/1.1" 200 65182 "http://static.ak.facebook.com/connect/xd_arbiter.php?version=9" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; InfoPath.2; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)"
  14.140.146.5 - - [27/Jul/2012:10:30:22 -0400] "GET /2009/08/05/asynchronous-procedure-execution/?fb_xd_fragment HTTP/1.1" 200 65182 "http://static.ak.facebook.com/connect/xd_arbiter.php?version=9" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; InfoPath.2; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)"
  14.140.146.5 - - [27/Jul/2012:10:30:22 -0400] "GET /2009/08/05/asynchronous-procedure-execution/?fb_xd_fragment HTTP/1.1" 200 65182 "http://static.ak.facebook.com/connect/xd_arbiter.php?version=9" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; InfoPath.2; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)"
  14.140.146.5 - - [27/Jul/2012:10:30:24 -0400] "GET /2009/08/05/asynchronous-procedure-execution/?fb_xd_fragment HTTP/1.1" 200 65182 "http://static.ak.facebook.com/connect/xd_arbiter.php?version=9" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; InfoPath.2; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)"
  14.140.146.5 - - [27/Jul/2012:10:30:24 -0400] "GET /2009/08/05/asynchronous-procedure-execution/?fb_xd_fragment HTTP/1.1" 200 65182 "http://static.ak.facebook.com/connect/xd_arbiter.php?version=9" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; InfoPath.2; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)"
  ...
  </code></pre>
  
  <p>Any idea what's causing Facebook to slam my server like this?</p>