Facebook Can Tell When You Last Had Sex

Some period tracking apps sent data to Facebook, BuzzFeed reports , including when you’ve had sex if you’ve logged it with the apps. They also share other information that you have recorded, from detailed medical data to your mood and the fact that you are using a menstrual app.

We know this because UK company Privacy International recently tested some of the world’s most popular menstrual cycle tracking apps on Android and released details of what data they found are being used by two apps: Maya by Plackal Tech and MIA Fem by Mobapp Development Limited. … A previous report found that Period Tracker from Leap Fitness Group; Flo Menstrual Cycle Tracker from Flo Health, Inc .; Period Tracking from Simple Design Ltd .; and Clue Period Tracker from Biowink. do not share detailed information with Facebook, according to the group’s analysis.

Why do menstrual cycle tracking apps want to share so much data? At least part of the reason seems to be related to advertising goals. Advertisers would like to know if you are trying to get pregnant, your mood, and more. The menstrual cycle counters in the report also asked if you use coffee, alcohol and tobacco, have digestive problems, use tampons or pads, what type of birth control you use, and more. You can also add your own notes to the app and they will be posted to Facebook as well.

The apps used the Facebook Software Development Kit (SDK), which provides developers with several tools: the ability to log in with Facebook, as well as targeting ads, analytics, and more. Application developers should not share sensitive information, and they should not collect information that they do not really need to run the application. Facebook told Buzzfeed that it plans to “discuss possible terms of service violations” with the developers.

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