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[ProPublica] It’s Complicated: Facebook’s History of Tracking You

Facebook is launching an aggressive technique to track people across the Web. For years people have noticed a funny thing about Facebook's ubiquitous Like button. It has been sending data to Facebook tracking the sites you visit. Each time details of the tracking were revealed, Facebook promised that it wasn't using the data for any commercial purposes. No longer. Last week, Facebook announced it will start using its Like button and similar tools to track people across the Internet for advertising purposes. […]

It's a bold move. Twitter and Pinterest, which track people with their Tweet and PinIt buttons, offer users the ability to opt out. And Google has pledged it will not combine data from its ad-tracking network DoubleClick with personally identifiable data without user's opt-in consent. Facebook does not offer an opt-out in its privacy settings. [...]

http://www.propublica.org/article/its-complicated-facebooks-history-of-t...