PwC/IAB: podcast ad revenue in the US hit $1.45B in 2021, up 72% YoY, and is expected to grow 47% to $2.13B in 2022 and double over two years to $4.2B in 2024 (Todd Spangler/Variety)

Todd Spangler / Variety:
PwC/IAB: podcast ad revenue in the US hit $1.45B in 2021, up 72% YoY, and is expected to grow 47% to $2.13B in 2022 and double over two years to $4.2B in 2024  —  Listen to this: The podcast advertising biz is continuing its upward trajectory — with U.S. ad sales expected to grow 47% this year …