Curious about what information–from the public to the personal–apps collect about you? PC Magazine sums it all up in one table. Check it out here: https://www.pcmag.com/news/366327/what-does-big-tech-know-about-you-basically-everything
Of course, if you want to know what data of yours are on the dark web, check out Have You Been Pwned? Probably Yes, So Here’s What You Do. Wondering if data you contributed “anonymously” is being traced back to you? Yes! Here’s how to figure out how likely you are to have your data traced back to you and how it’s done–Can Your Anonymous Data Be Re-identified?