Colin Huang, the 41-year-old Founder of Chinese e-commerce company Pinduoduo, has said that he will step down as Chairman of the company. His announcement comes after Pinduoduo reported it has surpassed Alibaba in terms of user base. Huang owns about 30% of Pinduoduo and ranks 21st on the list of world's richest persons with a net worth of $57 billion.