Just had a load of alerts from multiple servers stating sites were down or slow. Looks to be back up now, but I'm keeping an eye on it. Nothing I can find official, but Twitter is full of related tweets reporting similar issues.
" Update - This afternoon we saw an outage across some parts of our network. It was not as a result of an attack. It appears a router on our global backbone announced bad routes and caused some portions of the network to not be available. We believe we have addressed the root cause and are monitoring systems for stability now. "