[sfink]

Four exclamation points in a row is at least as clear as /s.

[5o1ecist]

Indeed. I thought it was obvious, exactly because of the excessive use of exclamation marks.

[BLKNSLVR]

I didn't even twig to the possibility that it might have been sarcasm until "cheese pizza eating billionaires".

I've seen too many serious posts containing such fervor and grammar (although mostly not on HN).