Instagram's lax privacy practices let a trusted partner track millions of users' physical locations,

A buzzy San Francisco startup has been secretly saving what appears to be millions of Instagram users' stories and tracking their locations. The marketing firm Hyp3r has been scraping huge quantities of data off the Facebook-owned app and using it to build up detailed profiles of people's movements and interests. The situation highlights how Facebook is still struggling to protect users' data and oversee developers accessing its platform, more than a year after the Cambridge Analytica...