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.
Looking at the NET tab in Firebug or Chrome developer tools, I can see the get on all.js failing.
After a few page refreshes, it works correctly, then 10 minutes later is again not serving the file.
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.
Is it “normal”? like Facebook limiting gets based on some “cap” or anything similar?
I have run into this same issue before. It was something that I could never really pin down but it was believed to be an issue with Facebook. My solution was to grab a copy of all.js and serve it up locally.