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A comment on Off-Facebook activity. Parent comment

Re:Off-Facebook activity by StavrosK on Wednesday January 29, 2020 @06:07AM (#22179318)
I use uBlock Origin and Privacy Badger on my desktop and phone, as well as Blokada, and yet Facebook still had a bunch of app activity even though I never ever sign in to stuff using FB (or even gave the apps my email or any other piece of personal data).

I literally just opened the app, granted no permissions, used it a bit, and Facebook associated it with my account. What the fuck.

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Re:Off-Facebook activity by the_snooze on Wednesday January 29, 2020 @09:14AM (#22180647)
They could be associating you server-side using persistent identifiers on your phone. For example, if an app has the Facebook SDK, it could send your IMEI to Facebook. Then, if you have a first-party Facebook app like Messenger, that too can send your IMEI to Facebook and link it back to your Facebook account.
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