The AI frenzy has investors fixated on revenue growth as proof of returns on AI spending that can be as high as $100 billion per year, depending on the company. Yet, Meta is proving that a stronger signal of AI strength may be found further down the income statement — in the bottom line. This quarter, average revenue per person (ARPP) is showing initial signs of bottoming with an important uptick YoY that was absent last quarter when ARPP declined YoY. Secondly, Meta has indicated their int...