Facebook has been collecting "intensely personal information" from millions of people - whether they have Facebook accounts or not, according to testing performed by the Wall Street Journal.
According to tests of more than 70 apps using software to monitor internet communications, the Journal found that "the apps often send the data without any prominent or specific disclosure," and that "Facebook software collects data from many apps even if no Facebook account is used to log in and if the end user isn’t a Facebook member."
Eleven of the apps tested sent Facebook "potentially sensitive information about how users behaved or actual data they entered."
https://www.zerohedge.com/news/2019-02-22/smartphone-apps-sending-intensely-personal-information-facebook-whether-or-not-you