Wire reports say the investment was made through the Li Ka-shing Foundation, and did not involve his flagship companies Cheung Kong or Hutchison Whampoa.
79-year-old Mr Li is a much-loved business superstar in Hongkong, a genuine rags-to-riches success in the former British colony.
The investment follows a series of high-profile stakes taken in Facebook in recent months. In October, Microsoft paid UA$240 million (A$272.5 million) for a 1.6 per cent chunk of Facebook.
Forbes magazine puts Mr Li’s personal fortune at about US$23 billion, making him the ninth wealthiest man in the world.
Mr Li and Microsoft’s investments value the privately-held Facebook at US$15 billion.
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