In this edition of "3.know," Sonata Insights' Williamson explains her plans for benchmarking and tracking the growth of AI, and shares findings from two just-released studies. You may remember her from Emarketer, Insider Intelligence and other roles.

A new financial "risk" has begun showing up in the SEC filings of some of the world's biggest advertisers and it's giving some analysts pause. Not surprisingly, it's AI.