HONG KONG (MarketWatch) -- Hong Kong tycoon Li Ka-shing said Thursday he has increased his personal investment in social networking site Facebook to more than US$100 million, and might invest even more.

"Facebook is doing very well and we could have some synergy between the 3G services of Hutchison and Facebook, so the customers could use Facebook on mobile phones," Li said during an earnings news conference for his company Hutchison Whampoa Ltd. HUWHY.