By , , (Reuters) - As U.S. President Donald Trump and his allies flooded social media on Wednesday with false claims of victory and unsupported allegations of voter fraud, social media companies warned users the presidential election had yet to be decided.But it is not clear whether the disclaimers and fact-checks, which often occur well after posts have been shared tens of thousands of times, are curbing the circulation of baseless claims. And in the case of Facebook, staff rewrote some of their rules on the fly.Critics say that, in environments explicitly built to promote instant sharing...…By , , (Reuters) - As U.S. President Donald Trump and his allies flooded social media on Wednesday with false claims of victory and unsupported allegations of voter fraud, social media companies warned users the presidential election had yet to be decided.But it is not clear whether the disclaimers and fact-checks, which often occur well after posts have been shared tens of thousands of times, are curbing the circulation of baseless claims. And in the case of Facebook, staff rewrote some of their rules on the fly.Critics say that, in environments explicitly built to promote instant sharing...WW…

By , , (Reuters) - As U.S. President Donald Trump and his allies flooded social media on Wednesday with false claims of victory and unsupported allegations of voter fraud, social media companies warned users the presidential election had yet to be decided.But it is not clear whether the disclaimers and fact-checks, which often occur well after posts have been shared tens of thousands of times, are curbing the circulation of baseless claims. And in the case of Facebook, staff rewrote some of their rules on the fly.Critics say that, in environments explicitly built to promote instant sharing...…By , , (Reuters) - As U.S. President Donald Trump and his allies flooded social media on Wednesday with false claims of victory and unsupported allegations of voter fraud, social media companies warned users the presidential election had yet to be decided.But it is not clear whether the disclaimers and fact-checks, which often occur well after posts have been shared tens of thousands of times, are curbing the circulation of baseless claims. And in the case of Facebook, staff rewrote some of their rules on the fly.Critics say that, in environments explicitly built to promote instant sharing...WW…