Mapping Countries That Censor the Internet

The Atlantic - Technology 

If you're having trouble with your internet connection, one of the first things tech support will ask you to do is to run a speed test. There are dozens of websites and apps that will, at the tap of a button, measure your network speed--but they can't tell you which sites you can actually access with that bandwidth. Even with a good connection, if you're in a country that censors the internet, whole swaths of the web might be out of reach. Now, there's an app that will test your internet connection not for speed, but for freedom. The program, ooniprobe, is part of a 5-year-old project called the Open Observatory of Network Interference, or OONI.