If for some reason you tried to visit some website other than Twitchy tonight, you might have found yourself redirected to a Facebook error page. Facebook acknowledged the bug and offered a brief explanation:

For a short period of time, there was a bug that redirected people logging in with Facebook from third party sites to Facebook.com. The issue was quickly resolved, and Login with Facebook is now working as usual.

The bug affected a lot of sites, since more and more are choosing to rely on Facebook Connect to handle such things as login credentials.

Twitter seems to have settled on “Facebookmageddon” as the word we’ll all use to describe what happened tonight to our great-grandchildren.