Reliability of Facebook authentication
I'm developing a web application using Facebook as an authentication service. Today, there was a service outage of the Facebook JavaScript SDK API.

The `http://connect.facebook.net/en_US/all.js` script, which provides the API, couldn't be loaded by the client because the DNS entry for `connect.facebook.net` was removed from their servers for over an hour. I checked with a friend on the other side of the world, and it was the same there.

Various sites that use Facebook for comments and authentication were affected. But there didn't seem to be much buzz online. I would have thought it would be a big deal, but several sites allow users to report Facebook being down, and none of them showed anything unusual. The conclusion would seem to be that nobody uses Facebook's services for anything that will really be missed. Facebook.com wasn't affected at all.

How often can we expect this sort of service interruption? Have any authorities (or bloggers) weighed in on this subject? Or is this relatively normal — I'm new to web programming, perhaps blowing it out of proportion.
Reliability of Facebook authentication
===

I'm developing a web application using Facebook as an authentication service. Today, there was a service outage of the Facebook JavaScript SDK API.

The `http://connect.facebook.net/en_US/all.js` script, which provides the API, couldn't be loaded by the client because the DNS entry for `connect.facebook.net` was removed from their servers for over an hour. I checked with a friend on the other side of the world, and it was the same there.

Various sites that use Facebook for comments and authentication were affected. But there didn't seem to be much buzz online. I would have thought it would be a big deal, but several sites allow users to report Facebook being down, and none of them showed anything unusual. The conclusion would seem to be that nobody uses Facebook's services for anything that will really be missed. Facebook.com wasn't affected at all.

How often can we expect this sort of service interruption? Have any authorities (or bloggers) weighed in on this subject? Or is this relatively normal — I'm new to web programming, perhaps blowing it out of proportion.