Lawmakers and privacy advocates immediately protested the practice, with many saying Facebook needed to develop a way for non-users
Congress is looking more broadly at Facebook's reach, beyond the user data leaks that brought Zuckerberg to testify
Facebook has admitted that information of up to 87 million people, mostly in the US, may have been improperly shared with the British political consultancy firm Cambridge Analytica
Amid data breach talks and the recent instance of Cambridge Analytica scandal, where unauthorised access to user data apparently caused election meddling, there have been calls to delete Facebook