Twitter boss seeks help with online abuse

Twitter has asked for help in devising a "Health check" to measure its contribution to public conversation. Its chief executive, Jack Dorsey, said the platform's "Instant, public, global messaging" had "Real-world negative consequences" that Twitter had neither fully predicted nor understood. Twitter has repeatedly been criticised for the amount of abuse and propaganda posted by some of its users. "We aren't proud of how people have taken advantage of our service, or our inability to address it fast enough," Mr Dorsey wrote on Twitter. On Thursday, British chef and activist Jack Monroe left Twitter "For the good of my mental health".

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