MUMBAI: The body running India's biometrics-based national identity card system has warned people against sharing their unique card number publicly after the country's telecom regulator tweeted his in a challenge to critics to do him "any harm". R S Sharma, the head of the Telecom Regulatory Authority of India (TRAI) and the Unique Identification Authority of India's (UIDAI) first director general, last week posted his Aadhaar number on Twitter after users challenged him to share the details to prove it was a safe system. As Twitter users dug out Sharma's personal details - including his phone numbers, WhatsApp profile, the brand of smartphone that he carries and his address - Sharma insisted he had not been harmed. People making Aadhaar numbers public or encouraging others to do so could be liable for prosecution and penal action, UIDAI said. -Reuters