If you have the Facebook app on your phone, Mark Zuckerberg would like to monitor your entire life by uploading every photo you take to a secret Facebook database and have AI identify every place you have been, every person you have met, every activity you have participated in, etc.
I do not know how Facebook lures people into turning this on, but I recommend everyone check their settings, and I have made these four pictures which show how you turn it off.
Please reply if yours was on.