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Their market cap doesn't have anything to do with how much cash they have.

The 170,000 doesn't have a precise unit, it could be losses in market cap, cash reserves, advertiser revenue, operating costs, literally anything.

I'm merely putting the number in perspective. 6 digits isn't really something that's particularly concerning on any Facebook spreadsheet.

I'm not sure what you mean by that. The 170,000 does have a precise unit - it's dollars lost in cash, as stated in the comment you were replying to.

The amount of time taken for Facebook to fold in minutes is represented by $TOTAL_CASH ÷ $170,000. There's nothing mystical about it.

But $TOTAL_CASH is entirely different from, and unrelated to, market cap. Market cap does not come into this at all, in any way.

Not all minutes are equal, so the real number is likely well north of $200k/min. And that is a lot, even for Facebook, with a large enough number of minutes. We're at >4 hours. So they've likely lost north of $50 million in advertising revenue today.

Market cap is not even remotely the same thing as cash reserves.