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c_user

Stores the Facebook / Instagram user ID of the signed-in visitor. When a third-party page loads a Meta embed, the cookie is sent to Meta — directly identifying the visitor across the web.

Does your site set c_user before consent?

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Expiry

1 year

Set by

Meta Platforms Ireland Ltd.

GDPR & ePrivacy guidance

c_user is a social media cookie. Under Art. 5(3) ePrivacy Directive and the GDPR, it must not be set before the visitor has given prior, informed, freely-given consent.

If your scanner finds c_user on a page before the visitor interacts with your consent banner, that's a violation — the cookie loaded without a legal basis.

Fix: gate the script that sets this cookie behind your CMP, so it only fires after the relevant consent category is accepted.

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