Marketing

"m_user" Cookie

Facebook

Description

Used to authenticate your identity on Facebook's mobile website. Contents: Email, User ID, authentication value, version, user agent capability, creation time, Facebook version indicator

Details

Cookie Name: m_user
Category: Marketing
Service: Facebook
Duration: 90 days
Data Source: Open cookie db

Consent Requirement

This cookie is classified as marketing/advertising. It requires explicit user consent under virtually all privacy regulations including GDPR, CCPA, and ePrivacy.

Consent Requirements by Regulation

GDPR & ePrivacy (EU)

Explicit prior consent is required before setting m_user. Advertising and tracking cookies are never covered by the strictly necessary exemption.

UK GDPR & PECR

Explicit consent is required before setting m_user.

CCPA/CPRA (California)

Setting m_user for cross-context behavioural advertising is treated as sharing personal information: provide a "Do Not Sell or Share" opt-out and honour the Global Privacy Control signal.

Managing m_user with a Consent Banner

A consent management platform keeps m_user blocked until the visitor opts in to the marketing category. Kukie.io's scanner detects it automatically, categorises it, and the banner's auto-blocking holds back the script that sets it until consent is given - visitors who decline never receive it.

Frequently Asked Questions

Does the m_user cookie require consent?

Yes. m_user is a marketing cookie and requires explicit prior consent under GDPR, PECR, and the ePrivacy rules, plus a sale/share opt-out under CCPA/CPRA.

How long does the m_user cookie last?

m_user typically persists for 90 days. The exact lifetime can vary with the site's configuration and the version of the script that sets it.

Who sets the m_user cookie?

m_user is set by Facebook. It is categorised as marketing.

How do I block or delete the m_user cookie?

Visitors can delete m_user at any time through their browser's cookie settings. Site owners can keep it blocked until consent with a consent management platform: Kukie.io's auto-blocking holds marketing cookies back until the visitor opts in.