Facebook says hackers could have also gained access to users' accounts on other apps and websites, including Instagram and Oculus accounts, via Facebook Login (Will Oremus/Slate)

Will Oremus / Slate:
Facebook says hackers could have also gained access to users' accounts on other apps and websites, including Instagram and Oculus accounts, via Facebook Login  —  Hours after Facebook announced on Friday a huge data breach that affected at least 50 million users, the news got worse.