I'm not sure social media is a very good measure, there are many reasons that wondering aloud about this specific topic isn't really incentivized there.

I'm not sure I've ever met anyone I would assume has not considered the basic questions of our existence. Unless they were severely mentally disabled, or something like that.

For a more public measure I suppose you could look at religion, which seems to be a fundamental attempt at answering those questions. Most people are religious or have some kind of religious belief.