It’s not even clear yet whether this has been a bad investment decision. Zuckerberg is playing a long game here, and the market is notoriously short-term, immediate-profits-driven. Long term investors may actually be quite pleased if this strategy turns out to be generation-defining. Obviously no person can say this with certainty, but they can see his track record — he’s gone against the grain on many occasions, at the peril of short term holders, only to dramatically increase the overall profits of the company exponentially.