Even if you don’t even have a facebook account, you are sharing lot of private information with Facebook where it is used for purposes you probably don’t want shared.
According to an article by Sam Schechner and Mark Secada in the Wall Street Journal:
“Millions of smartphone users confess their most intimate secrets to apps, including when they want to work on their belly fat or the price of the house they checked out last weekend. Other apps know users’ body weight, blood pressure, menstrual cycles or pregnancy status.
“Unbeknown to most people, in many cases that data is being shared with someone else: Facebook Inc.
“The social-media giant collects intensely personal information from many popular smartphone apps just seconds after users enter it, even if the user has no connection to Facebook, according to testing done by The Wall Street Journal. The apps often send the data without any prominent or specific disclosure, the testing showed.
“It is already known that many smartphone apps send information to Facebook about when users open them, and sometimes what they do inside. Previously unreported is how at least 11 popular apps, totaling tens of millions of downloads, have also been sharing sensitive data entered by users. The findings alarmed some privacy experts who reviewed the Journal’s testing.”
You can read the details in the Wall Street Journal at: http://tinyurl.com/20190225a.