KEY POINTS
  • Alphabet reported a sharp decline in ad revenue growth Monday, sending the stock down more than 8% on Tuesday.
  • Alphabet's CFO said changes to the YouTube algorithm caused lower engagement and ad revenue growth on the site.
  • Ruth Porat was probably referring to changes YouTube made to curb the spread of fake news and conspiracy theories. It shows YouTube is willing to forego some short-term ad revenue for the long-term health of the company.

Google has a YouTube problem, according to CFO Ruth Porat.

On Monday, after reporting that ad revenue grew 15% versus the 24% it saw a year ago, Google's parent company Alphabet saw its stock punished. It fell more than 8% Tuesday afternoon.