Flo covertly shares users' menstrual cycle data 

Period tracker Flo shared data with Facebook, Google and others every time a user had their period or indicated that they wanted to get pregnant, despite promising to keep users’ sensitive health data private.

Flo is a US-based period tracker and pregnancy app used by over 100 million people which allows users to 'access personalized health insights, virtual dialogs, and dozens of courses to learn how your cycle affects your body and well being.'

A critical WSJ article sparked a strong backlash from civil rights and privacy groups, as well as from customers.