In April 2020, Twitter began sharing more of our information with advertisers. The notice came via a rather odd notification that said "your ability to control mobile app advertising metrics has been removed" - essentially meaning that Twitter was now sharing data such as which ads you viewed or with. interacted with, along with your phone's tracking ID. Previously you could disable this – not anymore. (Unless you live in the European Union or the United Kingdom, where there are additional protections.)
ContentsUsing the Twitter mobile app:Using the web version of Twitter:Turn off ad personalizationSee your Twitter data
Although this protection has been removed, there are still a few privacy tools available that can give you at least some measure of how much of your data is shared with advertisers. If you're concerned about privacy, it's worth taking a few minutes to find and turn them off. To do this, you must go to the “Personalization and data” page.
The rest of this article will assume that you are using the web version.
On the "Personalization &Data" page, you'll find several ad settings that allow Twitter to "further personalize" your advertising using information based on your "inferred identity", location, or other factors. (Go ahead and read all the descriptions – they're worth knowing.) You can choose to enable any of these settings if you want, but if not, use the toggle at the top of the page to disable all settings on the page.
If you want to take it a step further, and check what other data Twitter knows about you (and possibly delete at least some of it), scroll down to the "Personalization and data" page and click on “View your Twitter data. Check out all these topics; you might be surprised by some of the information there. Here is a brief summary of each.
The other two categories here, "Deemed Partner Interests" and "Custom Audiences", can be turned off using the "Personalization and Data" page.
Want to be really safe? You might just want to bite the bullet and completely delete your Twitter history.