By Sankalp Phartiyal and Krishna V Kurup MUMBAI/BENGALURU (Reuters) - Facebook Inc's WhatsApp is rolling out a global test measure to rein in messages forwarded by users, the messaging app said, after the spread of rumors led to several killings in India and sparked calls for action from authorities. Violence triggered by incendiary false messages in India, WhatsApp's biggest market with more than 200 million users, has spurred government demands to prevent circulation of false texts and provocative content and caused a public relations nightmare. False messages about child abductors on WhatsApp have led to mass beatings this year of more than a dozen people in India, some of whom have died.



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