> By better understanding how different browsers and devices are related, we can use information from one browser or device to help personalize the Twitter experience on another. For example, if you commonly use Twitter for Android around the same time and from the same network where you browse sports websites with embedded Tweets on a computer, we may infer that your Android device and laptop are related and later suggest sports-related Tweets and serve sports-related advertising on your Android device.
If you make a data-access request in GDPR you might actually get a massive CSV file with this data in it. Obviously some automated system put it together, not control F, but the legal team totally could be using CSV
https://help.twitter.com/en/about-personalization-across-you...
> By better understanding how different browsers and devices are related, we can use information from one browser or device to help personalize the Twitter experience on another. For example, if you commonly use Twitter for Android around the same time and from the same network where you browse sports websites with embedded Tweets on a computer, we may infer that your Android device and laptop are related and later suggest sports-related Tweets and serve sports-related advertising on your Android device.