facebook 研究 facebook c_userFacebook Tracking Through Social Plug-inshttps://securehomes.esat.kuleuven.be/~gacar/fb_tracking/fb_plugins.pdfhttps://www.dataprotectionauthority.be/sites/privacycommission/files/documents/technical_report_03_2017.pdfhttps://medium.com/@TechExpertise/facebook-cookies-analysis-e1cf6ffbdf8a