Other major shareholders include Russia's DST Global, which owns 7 percent; Goldman Sachs, which owns 3.5 percent; early backer Peter Thiel, who owns 2 percent; T. Rowe Price, which owns 1 percent; and Marc Andreessen and his venture capital firm, Andreessen Horowitz, which owns a fraction of a percent.
The returns to those individuals will depend on when they bought in, with Thiel, who invested $500,000 back in 2004, standing to do the best in percentage terms.
However, later investors who bought in at richer valuations should still make significant cash returns, albeit not as impressive in percentage terms. In 2010, Andreessen Horowitz, for example, spent $50 million for its shares, valuing Facebook at $35 billion. Goldman and DST bought in at a $50 billion valuation.