BEIJING (Reuters) - China's Tencent Holdings Ltd said on Thursday the coronavirus drove 8 billion visits to its WeChat platform as users flocked to get "health codes" they need to show authorities in order to travel around the country.Reporting slightly lower than expected fourth quarter profit on Wednesday, the gaming and social media giant said in a statement it did not expect the epidemic to have any significant impact on its financial position to date.This is markedly different from many..