Secret Sauce: What it is, and How to Apply for best PR Results
Flack's Revenge
DECEMBER 7, 2020
If you plug “secret sauce” into the Google Ngram viewer , which charts word usage in books dating back to 1900, you will see the first mentions in the early 1970s (confirming the Burger Wars theory), with rapid growth occurring around 2000 (perhaps, not coincidentally, during the dot com boom). Not necessarily. Just ask Zappos.
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