The number of monetizable daily active users grew to 211 million in the third quarter.
Analysts surveyed by Thomson Reuters expected the company to report 212.6 million daily users in the third quarter.
TheiPhonemaker recently rolled out a feature that requires users to give permission to apps that track their online activities.
Facebook and Snap have already said the changes have weighed on their performance.
Twitter, though, said the impact on its third-quarter revenue and fourth-quarter guidance was lower than expected.
Twitter reported revenue that was slightly below Wall Street’s expectations.
Twitter’searningscome amid heightened scrutiny of social media.