Japan is planning to tighten regulation of tech giants like Google and Facebook after an expert panel called for better oversight on competition and privacy, an official said Thursday. Japan has followed in the footsteps of other countries in scrutinising the dominant role played by the world's largest information technology companies, including Big Four tech firms Google, Apple, Facebook and Amazon. Despite bringing benefits, tech giants "tend to monopolise the market through their features such as... low costs and economies of scale," the report said.