The idea that Facebook is bigger than Exxon was back in 2010 (even with the rate of inflation), when electric cars were still a wet dream, crazy. Even more, the amount of "usefulness" as well. I'm not arguing that we should keep oil as a fuel source, but you have to admit, right now, if a big player (like Exxon) in the field just vanished, it would have a painful impact. At least fuel supply would be a bit crazy for a while until the competitors can ramp up to meet demand depending on reserve supplies being used. If Facebook just suddenly disappeared... meh. I mean, second and third order consequences... meh. Small business ads would need a new place, but that's not crazy bad. More inconvenience. Advertising companies would need a new supplier, but no really likes them anyways. Well, a lot of job openings, that's a problem. But I'm thinking beyond that, because no matter what the industry, a large player just folding suddenly causes a significant job shortage. That's a common denominator. But a hampering access to fuel supply vs. a social media wall for the general publish... one is more important than the other. At the very least, the other Faang companies have... useful significance?
Edit: I'm aware of the limits to market cap. There's no perfect way of figuring out the size of a company. My point, there's a large level of monetary value in these companies and a difference in how they are significant in daily livelihood for the everyday person. It's just interesting how large Facebook is by a metric but how incredibly useless it is compared to another company using the same metric. It's the same how theres an interesting difference between the market cap of Tesla and Ford. Tesla is larger but they make a fraction of the amount of sellable goods. It's one thing to know this, but to see significant numbers, that makes it more interesting.