Github has been down for about two hours now. No good public information that I can find so far, except that they mention a "network disruption" in early status updates. However, nothing interesting is showing up in BGPlay (like a shift over to Prolexic due to a DDoS). Their colocation provider is Rackspace, but Rackspace hasn't posted about any wider issues.
https://status.github.com/graphs/past_day Alex Forster
