Tim Berners-Lee calls for tighter regulation of online political advertising

Inventor of the worldwide web described in an open letter how it has become a sophisticated and targeted industry, drawing on huge pools of personal data

Sir Tim Berners-Lee, the inventor of the worldwide web, has called for tighter regulation of online political advertising, which he says is being used in "unethical ways".

"We urgently need to close the 'internet blind spot' in the regulation of political campaigning," he said, writing in an open letter marking the 28th anniversary of his invention.