Russian Oligarch Alisher Usmanov

The Russian billionaire who is one of Facebook's biggest investors believes that the social networking company's potential is "not fully understood" — even by the company itself.

Alisher Usmanov, the Uzbekistan-born founder of USM Holdings who is Russia's richest man according to Forbes, told CNBC that he was happy with the outcome of the company's much-publicized initial public offering, the biggest of 2012.