There were cryptic billboards in the last 2 tech booms too (dotcom, web 2.0) - the one that comes to mind is the Google ones that were a puzzle that led to a re

There were cryptic billboards in the last 2 tech booms too (dotcom, web 2.0) - the one that comes to mind is the Google ones that were a puzzle that led to a recruiting funnel (2004: https://www.npr.org/2004/09/14/3916173/google-entices-job-searchers-with-math-puzzle https://www.npr.org/2004/09/14/3916173/google-entices-job-se...)