title: Two days that all.js (Facebook SDK) is randomly not loading
body: <p>we are experience since yesterday the "FB is not defined" error, caused by Facebook not serving all.js, which is the core Javascript SDK file.</p>
  
  <p>Looking at the NET tab in Firebug or Chrome developer tools, I can see the get on all.js failing.</p>
  
  <p>After a few page refreshes, it works correctly, then 10 minutes later is again not serving the file.</p>
  
  <p>Is it a Facebook issue? Apparently we have no other network error, and we are not behind a proxy. Anyone else experiencing it? Facebook status page is not reporting any problem, and I cannot find anything recent on Google.</p>
  
  <p>Is it "normal"? like Facebook limiting gets based on some "cap" or anything similar?</p>