Twitter's chief executive officer Dick Costolo
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Twitter CEO: 'We must respect the user's voice'

Speaking during the Web 2.0 summit in San Francisco, Twitter's chief executive officer Dick Costolo has revealed that one of the company's core values is to respect the user's voice.

Referring to the London riots in August and the use of social media to instigate violence, Costolo defended Twitter, claiming the majority of tweets sent were done so in a positive manner to organise clean ups and to help others.

Costolo added that with Twitter being a public publication, you have to hope that "the majority of the publications are going to help matters, not to forment violence".