HONG KONG (Reuters) – The president of Chinese ride-hailing giant Didi Chuxing and her father, the founder of Lenovo, have ended their public presence on China’s main social media site, the latest Chinese tech leaders to retreat from the spotlight. Didi’s Jean Liu and her father, Liu Chuanzhi, both switched on a function on China’s Weibo platform to hide all old posts, at some time during the just-ended Labour Day holiday. Neither had posted in the past six months. The elder Liu, who has 880,000 followers and his daughter, who has 10 million, did not give any reasons for going...