But even if he did, that doesn't require that he ignore negative externalities. Facebook has a Net Promoter Score similar to what health insurance companies and monopoly utilities do. Zuckerberg himself is disliked by 2/3rds of humanity. That's not good for long-term shareholder value.
Something else that's bad for long-term stock values? Profiting from slowly destroying the health of the societies in which all your customers live.
“Shareholder value” is ambiguous for good reason. It defers to the Board’s judgement. Fiduciary responsibility doesn’t excuse this sort of incentivizing of crime.
Is that true?
And if it is true, he controls 60% of the voting power because he owns class B shares that get 10 votes each. Do you think he will sue himself if he fails to wring every last dollar out of Meta?
Your second question is not relevant because you do not have to be the majority shareholder to initiate such an action.
The idea that companies should “maximise shareholder value” is a key ideal of some political/economic ideologies (especially what people describe as ‘neoliberalism’) but it’s not law.
I'm going to set up two axioms to arrive at an extrapolated conclusion.
One: Human psychology tends to ascribe more weight to negative things than positive things in the short term. In the long term this generally balances out, but in the short term it's more prudent in a biological sense to pay attention to the rustling in the bushes than the berries you might pick from them. This is known as the [negativity bias](https://en.wikipedia.org/wiki/Negativity_bias).
Two: The modern gatekeepers of social interaction, Big Tech, employ blind algorithms that attempt to steer your attention towards spending more time on their platforms. These companies are the arbiters of the content we experience daily and what you do and don't see is mostly at their discretion. The techniques they employ, in simple terms, are designed to provoke what they call 'engagement'. They do this because at the end of the day FAANG have not only a financial interest, but a fiduciary duty to sell advertisements at the behest of their shareholders. The more they can engage you, the more ads they can sell. They employ live A-B testing, divide people into cohorts and poke and prod them with psychological techniques to try and glue your eyeballs to their ads.
Extrapolated conclusion: These companies have a financial and legally binding interest to divide the population against itself, obstructing politics and social interaction to the point where we might not be able to achieve any of the goals that we need to reach to prevent oblivion.
Ironically he seems to be very sensitive to this judgment. You would think he would also take action on the basis of it, but so far, seemingly not?