In his “State of the State” speech on Tuesday, Newsom said California is proud to be home to tech firms. But he said companies that make billions of dollars “collecting, curating, and monetizing our personal data have a duty to protect it. Consumers have a right to know and control how their data is being used.”

He went further by suggesting the companies share some of those profits, joining other politicians calling for higher levies on the wealthy in U.S. society.

“California’s consumers should also be able to share in the wealth that is created from their data,” Newsom said. “And so I’ve asked my team to develop a proposal for a new data dividend for Californians, because we recognize that data has value and it belongs to you.”

Newsom didn’t describe what form the dividend might take, although he said “we can do something bold in this space.” He also praised a tough California data-privacy law that will kick in next year.

The world’s largest internet advertising companies, including Alphabet’s Google and Facebook are based in California. Google made more than $30 billion last year, while Facebook earned over $22 billion.

Alphabet shares gave up some gains in New York trading, while Facebook turned negative, following Newsom’s comments. Representatives of the companies didn’t immediately respond to requests for comment.

Privacy advocacy groups lauded the governor’s announcement while calling for full consumer transparency about how their data is being used and how much it’s worth to companies profiting from users’ online browsing patterns.

“While platforms are fast and loose with consumer data, they are not so willing to share what they are doing with the data or how much they are profiting,” said James Steyer, founder of Common Sense Media, which played a central role in drafting and passing the California Consumer Privacy Act in 2018.

“We fully support the governor’s data dividend proposal and expect to introduce legislation that reflects that in the coming weeks.”