Facebook's (NASDAQ:FB) Cambridge Analytica scandal, which compromised the personal data of up to 87 million users, caused many Americans to question tech companies' data-sharing practices. Therefore, it isn't surprising that a recent survey by Sailthru found that the majority of 1,000 American adults polled were "uncomfortable" with brands buying or selling their personal data.

How Americans feel about brands selling their personal data.

Data source: Sailthru. Chart by author.

Other studies confirm that growing distrust. Identity management software provider Janrain found that 53% of U.S. adult internet users didn't want their personal data being used for targeted ads. News site Axios reported that 55% of U.S. internet users were concerned that "the government will not do enough to regulate the way tech companies operate." A Thomson Reuters survey also found that among U.S. Facebook users who were sharing less content on social media, 47% cited privacy concerns.

Those numbers look bleak for companies like Facebook, which generates most of its revenue from targeted ads. However, Facebook doesn't actually "sell" users' personal profiles to companies. Instead, it lets brands personalize ads for certain demographics based on variables like sex, age, location, and interests.

Leo Sun has no position in any of the stocks mentioned. The Motley Fool owns shares of and recommends Facebook. The Motley Fool has a disclosure policy.