Many institutional investors think Zuckerberg has done a great job running the company, and think he'll probably continue to do a better job than a replacement CEO. As such, they want him to continue to run the company to maximise the value of their own shares. Shareholders actually voted to allow a stock split that would have allowed Zuckerberg to maintain his voting majority while allowing him to reduce his ownership share[1], though the split didn't eventually take place[2].
(Also, obviously this isn't true of all startups. Travis Kalanick was a drag on Uber's valuation, even though he can probably take a lot of credit for its rise.)
These different voting classes are controversial, but it's also important to note what rights are not diluted as well. To wit: you get the same dividends as everyone else (hmm...) and the same rights as other shareholders to the furniture if they go tits-up (also hmm...).
And to me that's the biggest argument against these different classes -- for companies that are unlikely to ever pay a dividend, they call into question what shares actually are, and why they should have value at all.
1: https://www.recode.net/2016/4/27/11586478/facebook-stock-spl...
2: https://www.recode.net/2017/9/23/16354302/why-mark-zuckerber...
To be fair, isn't that how most money is made in the stock market?
And apparently people think investors are opposed to keeping Zuckerburg in control because he doesn't have great people skills or something, even though he got that mobile duopoly.
Dividends are merely one of three ways that companies can return value to shareholders.
The latter, of course, is rather unlikely.
Please don't post like that to HN. It breaks the site guidelines: https://news.ycombinator.com/newsguidelines.html.
Your comment would be fine without the first sentence.
Greater fool doesn't really apply while revenue keeps growing.
But the second class shares do have board voting rights etc, so they do have some degree of control. And even Zuckurberg can't ignore his board completely.
Travis Kalanick had a 2-class share system working for him too.