[ypolito]

Why don't they analyze the data themselves instead of sending such personal information to FaceBook?!

If they don't have the available resources/capabilities to build or self host an analytics platform, do they really need that data analyzed?

Have their users explicitly allowed them to send such data to Facebook? Why not use a company that has a better record in respecting peoples' privacy. No wonder why things like GDPR exist!

[lancesells]

While I agree this is not a good thing you could say the same thing about the 100s of millions of sites and apps that use Google Analytics.

[dhimes]

True, but this is extremely personal information. Google has information on whether or not you are searching for information on breast cancer treatments. Combine with some health/fitness analytics and they can probably deduce whether or not you have breast cancer, and not a family member.