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I think this is the crux of the issue. Is Zuckerberg amongst the most productive individuals in the society? As another example, was Steve Jobs so much more productive than his competitors. Can Warren Buffet be considered productive at all, for that matter (we wouldn't have a shortage of insurance companies, sugar water selling companies, furniture and apparel companies if the specific ones Buffet invested and makes his money in never existed)? Note, I'm only mentioning individuals I am a fan of here. There are many worse examples than these.
Just taking Zuckerberg for example, while he obviously did something extremely useful, his greatest "productivity" (as defined by his earnings) was that he happened to be the one whose social network, amongst the many hundreds of combinations being tried at the time, happened to have the right combination of factors that made it extremely popular. Is that reason enough to award him so much more control over the future of society as opposed to the guy who invented Orkut, for example?