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Facebook recently announced that they will begin offering a first-party cookie option for the Facebook Pixel. Previously, they only used third-party cookies. From their documentation:

You can now use both first and third-party cookies with your Facebook pixel. The difference between first and third-party cookies lies in who owns the cookie.

First-party cookies are owned by the website a person is currently viewing, while third-party cookies belong to a website other than the one a person is currently viewing. Compared to third-party cookies, first-party cookies are more widely accepted by browsers and stored for longer periods of time.

The option to use both first-party and third-party cookies will be released on October 24, 2018.

My questions are:

  • How does this work technically?
  • How can a third-party JavaScript script set a first-party cookie?
  • What was preventing Facebook from doing this before?
  • What are the implications for the user's privacy?
  • Does this successfully get around Safari's new intelligent tracking protections?

I'm searching for the technical details that haven't been included in Facebook's announcement.

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