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Seems like, no. On their EU Privacy Policy, it says:

“Today, Facebook does not use your WhatsApp account information to improve your Facebook product experiences or provide you more relevant Facebook ad experiences on Facebook.“

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That "Today," hook sure sounds rather ominous to me.

"Today, I've not murdered you yet! Look at that accomplishment I've made!"

prbly they're not using it to 'improve', but to e.g. worsen? That statement would be legally true. lol.

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