Shares of Star Plus Legend Holdings [HKG: 6683], an investment holding company co-founded by Jay Chou's mother and others, almost doubled in value to HKD12.72 (USD1.62) each in Hong Kong after the Chinese singer-songwriter opened an account on #Douyin today, gaining over one million followers within an hour. The Chinese short video platform owned by ByteDance earlier denied spending a nine-figure sum for this signing, according to Sina Tech. #JayChou