India's internet curbs are part of growing global trend

As internet use has surged, especially in developing world, so have attempts to switch off flow of information

On Thursday, internet shutdowns came to the capital city of the world's largest democracy.

The suspension of data services, phone calls and texting to curb protests in parts of Delhi was an inauspicious milestone for a tactic that is becoming an increasingly common tool for authoritarian governments - but practised most often by India.