The Fail Whale flails
Date: June 3, 2013
Duration: About 45 minutes
Failure: Twitter's infamous Whale of Doom reared his blubbery head this summer when the service crapped out for just under an hour. During that time, users were unable to access the service to send or read tweets. After the first 25 minutes, service returned for some folks but remained slow and spotty for a while longer.
In the grand scheme of things, of course, a single outage of 45 minutes is pretty impressive for a service that used to be offline more often than not.