After the better part of a day, Facebook’s “family of apps” is being restored to normalcy.

Small outages are not unusual, even for sites of this size—although, in recent memory, protracted inaccessibility of major services is more often caused by backbone outages.

The cause for Facebook, Instagram, and Oculus’s long (and probably costly) goof?

Allegedly, some sort of “server configuration change,” according to a company post on competing social network Twitter.

Yesterday, as a result of a server configuration change, many people had trouble accessing our apps and services.

We've now resolved the issues and our systems are recovering.

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