Youre watching bbc news at 9 with me, rebecca jones. The headlines psychiatrists and campaigners call for social Media Companies to be forced to hand over data to universities for research into the potential harms of using the technology. We asa we as a world, notjust a country, would better understand the sort of pressures and problems being forced upon young people by social media platforms. Irans Supreme Leader, ayatollah ali khomenei, leads friday prayers in the capital tehran for the first time in eight years. Were in glasgow for our series our planet matters. The city has committed itself to become the first net zero emissions city in the uk. Im Annita Mcveigh here in the city, well be answering your questions about how glasgow might achieve its objective and all environmental matters juat after half past. Rebecca long bailey and Emily Thornberry set out their visions for the labour party, as they launch their rival bids to succeed Jeremy Corbyn as leader. In sport, englands cric