Previous research has shown how 42.55 percent of free apps on the Google Play store could share data with Facebook, making Facebook the second most prevalent third-party tracker after Google’s parent company Alphabet. In this report, Privacy International illustrates what this data sharing looks like in practice, particularly for people who do not have a Facebook account. Facebook routinely tracks users, non-users and logged-out users outside its platform through Facebook Business Tools.
— source privacyinternational.org | Dec 29, 2018