Period-tracking apps "sending users' medical data to Facebook"
A number of popular period-tracking apps are sharing women's private medical information with Facebook.
This is according to news from UK privacy group Privacy International, which says several popular menstrual cycle monitoring apps are sending data including information on sexual activity, use of contraception, timing of periods, and symptoms to the social network.
As Buzzfeed reports, the group singled out apps MIA Fem and Maya, which have millions of users between them.
The data is being shared through Facebook's Software Developer Kit, which is used to collect data to enable the platform to serve personal ads.
The SDK is used for ad personalisation not only on Facebook itself, but also off-platform.
Maya's parent company denies that the app shares personally identifiable or medical data with Facebook.