SAURABH SHARMA and ROLI SRIVASTAVA AS India's daily coronavirus cases set global records, people desperately searching for hospital beds and oxygen cylinders are finding help on social media. But for others like Ruby Yadav, who has never heard of Twitter, time and hope is running out. Travelling by rickshaw, Yadav and her mother - who is seriously ill with COVID-19 - have been turned away by nearly a dozen public hospitals in the northern city of Lucknow this week as the country's health system crumbles. "I'm losing hope. We know what will happen next, but I can't bear to watch…