Internet filtering has been a standard tool for fighting unwanted online content for more than a decade. However, the debate over its legitimacy and effectiveness continues to rage, pitting politicians and regulators against technologists and free speech advocates.
From China, where activists fight against the country's "Great Firewall", to the US, where Hillary Clinton, the US secretary of state, recently promised to bring an Internet freedom agenda to the forefront of politics, discourse around filtering has reached a fever pitch.
Once the domain of repressive regimes, Internet filtering has begun to make inroads in the West, with several countries harbouring secret blacklists, and still others weighing the practicalities and legal constraints of filtering.
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