https://www.reuters.com/article/idUS275871279920151202
> At Facebook, Zuckerberg’s stake, worth some $45 billion, comes with more than 53 percent of the votes in any shareholder poll, according to company filings. That rises to nearly 60 percent including stock owned by co-founder Dustin Moskovitz, which Zuckerberg usually gets to vote.
Note that there have been share sales since the time of this article (2015), so I would assume that the majority has become even more dependent on others voting his way (I wouldn’t know what the board has granted since then, which is a whole other topic...)