"it's well known that countries such as China, Iran, Pakistan, Saudi Arabia and Vietnam and South Korea all use a number of techniques to prevent their citizens gaining access to certain types of traffic. These techniques include blocking certain IP addresses, filtering traffic with certain URLs in the data packets and prefix hijacking, any of which could affect international traffic.
But according to Karlin and co, very little international traffic is routed through these countries so they pose a relatively small threat.
Less well known, they say, is that countries like Great Britain and Australia also censor traffic, albeit ona less pervasive scale. And that huge amounts of international traffic is routed through Britain.
The only country that is more influential than Britain by a measure invented by Karlin and co called the Country Centrality, is the US. The US, along with Sweden, allows wiretapping of international traffic without a warrant, not everybody's cup of tea. But routing your internet traffic to avoid the US, or Britain for that matter, would be a tricky business."
Josh Karlin website: http://www.cs.unm.edu/~karlinjf/#[[About%20Me]]
Josh Karln on "Mysteries of the Unregulated Internet" https://www.research.gov/rgov/gov/research/core/cms/news/printNewsDetail.jsp;jsessionid=R2hqJdvLG5PL915GQzMJb60hhvCJSrzQrLSnvG54F1G8TX08M7tQ!-34539227?nodePath=/BEA%20Repository/news/items/1223069797045
Scientific papers by Josh Karlin: http://en.scientificcommons.org/josh_karlin