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WhatsApp may expose the OS you use to run it – which could expose you to crooks
(www.theregister.com)
Icon base by Lorc under CC BY 3.0 with modifications to add a gradient
99% of browsers and their forks also expose your real OS via javascript (
navigator.platform
), even on Tor Browser. Some in the privacy community say this information is actually worthless (it could be lying), but I don't know for sure.