The Pirate Bay was affected.
So was Twitter.
Other sites that went down were Reddit, Gawker media sites, StumbleUpon, Yelp, FourSquare, LinkedIn, and Meetup.
Strangely, Fark was down, but it was a planned outage to move equipment. It just coincided with the leap second crash.
Most of the websites that were affected are back up, or will be soon.
(Image credit: Flickr user Alan Cleaver)
Perhaps some idiot application developers assumed seconds run from 0 to 59 and did not plan for second 60 -- (much like Y2K; but leap seconds happen all the time, more frequently than leap years) -- but every Unix API that manipulates time is prepared for the 61st second in a minute. (Afterall, it is clear that many of the developers of the affected sites are poor developers -- remember the six-million unsalted and un-iterated password hashes stolen from LinkedIn? Salted and iterated password hashes were already in use on Unix systems in the late seventies, showing that the LinkedIn geniuses were three decades behind everyone else. But that too is a digression for another day.) Reasonable applications would do the same and just keep track of time using the Unix epoch.
No, the more likely cause is probably over-reliance on a single datacenter that did not survive a storm: http://m.wired.com/wiredenterprise/2012/06/real-clouds-crush-amazon/
Reddit, Gawker, StumbleUpon, Yelp, FourSquare, LinkedIn, and Meetup all located all their servers in a single data centre that went down at midnight as the result of a storm? Or are you saying that all of these companies a single datacentre each in completely different physical locations which were all hit by storms bad enough to take them down at exactly the same time? Whatever you're saying it doesn't make sense.
Actually TBP went down three hours before midnight, so it wasn't caused by the leap second. It was actually caused by a rack being moved.
Reddit attributed their outage to Casandra not coping with the leap second. Mozilla confirmed that Hadoop had problems with the leap second. It's been confirmed that debian.squeeze servers all over the place died as a result of the leap second, the workaround apparently was to disable ntpd. So it looks like the stories are true.
Why is it that whenever a problem arises with anything to do with Linux there's always some sad fanboi desperately trying to blame something, anything else?