It’s widely known that China runs a pretty tight ship – to put it mildly – on what its citizens get to see online, especially that content which exists outside of China. YouTube has been blocked for some time and although Wikipedia was blocked for a while, it’s gradually become more available. However today Chinese authorities have come down like a tonne of bricks on a number of services including Twitter, Flickr, Bing, Live.com, Hotmail.com, Blogger and a number of other sites. And that’s no joke, given that we’re talking about the Great Wall of China here.