State-led censorship of the internet is on the increase around the world and includes some of the fastest growing economies.
Thousands of sites across 120 Internet Service Providers were surveyed and it was discovered that up to 25 of 41 countries investigated showed evidence of content filtering.
The study by the OpenNet Initiative found that a wide range of websites and services were being routinely blocked in these countries, including the likes of Skype and Google Maps.
Similar filtering was only being conducted by a handful of countries in 2002 when a previous study was conducted and the significant increase in censorship is undoubtedly a cause for concern.
The survey found evidence of filtering in the following countries: