The problem with depending on one provider (facebook) for anything

That's why you try to minimize your dependencies on third party services for your own business critical sites.

If you don't really need that .js widget it is better to do without it, if you do really need it make sure it fails gracefully if it isn't available.

Sometimes that means that you have to verify if the service is up periodically, and serve up modified pages during downtime for the widgets.

Yep. I was just asking about this in an irc channel. One guy's connecting fine, the guy sitting next to him in his office is can't get to the site at all.

edit: 18:10 EST, seems to be back up.

Here's the screenshot, for good measure: http://i.imgur.com/CMZgW.png

Indeed: http://cl.ly/aRl