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A comment on Facebook Is Giving Advertisers Access To Your Shadow Contact Information. Parent comment

Re:Facebook Is Giving Advertisers Access To Your Shadow Cont... by mariusmg on Thursday September 27, 2018 @03:58AM (#18082743)
Well, Instagram and FB being 2 separate domains , they shouldn't (in theory at least) be able to access each others cookies in browser. The tracking is most likley still server side based.

Based on what the OP is writing, the unique identifier foe the user can even be the IP address...

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Re:Facebook Is Giving Advertisers Access To Your Shadow Cont... by krn on Thursday September 27, 2018 @04:34AM (#18082890)
They shouldn't be able to access each other's cookies at the browser's level, but instagram.com might include third-party javascript code from facebook.com, which connects the two accounts in the system.
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