Does Facebook track you even if you don't have an account?
Yes. A 2019 Wall Street Journal investigation tested more than 70 iOS apps and found at least 11 — including a heart-rate monitor and a period tracker — sending sensitive data to Facebook via its App Events SDK within seconds, regardless of whether the person using the app had a Facebook account at all.
Answered in
How Meta Actually Tracks You: Inside Facebook, Instagram and WhatsApp's Surveillance MachineA localhost backdoor beat Incognito Mode. Instagram DMs lost encryption entirely. Here's how Meta's tracking machine really works, fact by fact.
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