What you are supposed to see there is not "value" but "profit and potential".

If a utility company which provides basic necessities were to make a lot of profit, wouldn't it be sort of a bad outcome for humanity? Isn't it better if basic necessities are provided to us at the most affordable prices?

It's extremely difficult for a commodity utility company to rival the likes of Facebook on potential profit, though (in most cases it's impossible, as most countries regulate utility costs, but even in a fully free market system there's limited room for profit margins).

Share value isn't based on value to humanity; it's largely based on profit and potential profit.

It's the comparison between two individual companies in different field that is irrelevant.

My point is that the valuation comparison OP posted has nothing to do with "life without utility companies and imagine life without FB".