Authentication

• For example: We use cookies to keep you logged in as you navigate between Facebook Pages. Cookies also help us remember your browser so you don't have to keep logging in to Facebook and so you can more easily log in to Facebook via third-party apps and websites. For example, we use the "c_user" and "xs" cookies, including for this purpose, which have a lifespan of 365 days.

Security, site and product integrity

• For example: Cookies can help us identify and impose additional security measures when someone may be attempting to access a Facebook account without authorisation, for instance, by rapidly guessing different passwords. We also use cookies to store information that allows us to recover your account in the event that you forget your password or to require additional authentication if you tell us that your account has been hacked. This includes, for example, our "sb" and "dbln" cookies, which enable us to identify your browser securely, as well as “datr." "Datr" is a unique identifier for your browser that, amongst other things, helps us protect you from fraud. For example, it helps us identify trusted browsers where you have logged in before. “Datr” has a lifespan of 400 days.

• For example: Cookies help us fight spam and phishing attacks by enabling us to identify computers that are used to create large numbers of fake Facebook accounts. We also use cookies to detect computers infected with malware and to take steps to prevent them from causing further harm. Our "csrf" cookie, for example, helps us prevent cross-site request forgery attacks. The “datr” cookie also helps us to identify the browsers used by malicious actors and to prevent cyber-security attacks, such as a denial of service attack that could prevent you from accessing the Meta Products. Cookies also help us prevent underage people from registering for Facebook accounts.

Advertising, recommendations, insights and measurement

• For example: Cookies allow us to help deliver ads to people who have previously visited a business’s website, purchased its products or used its apps and to recommend products and services based on that activity. Cookies also allow us to limit the number of times that you see an ad so you don’t see the same ad over and over again. For example, the "fr" cookie is used to deliver, measure and improve the relevancy of ads, with a lifespan of 90 days.

• For example: We use cookies to count the number of times that an ad is shown and to calculate the cost of those ads. We also use cookies to measure how often people do things, such as make a purchase following an ad impression. For example, the "_fbp" cookie identifies browsers for the purposes of providing advertising and site analytics services and has a lifespan of 90 days.

• For example: We can use cookies to prevent you from seeing the same ad over and over again across the different devices that you use.

• For example: We use cookies to help businesses understand the kinds of people who like their Facebook Page or use their apps so that they can provide more relevant content and develop features that are likely to be interesting to their customers.

Site features and services

• For example: Cookies help us store preferences, know when you’ve seen or interacted with Meta Products’ content and provide you with customised content and experiences. For instance, cookies allow us to make suggestions to you and others, and to customise content on third-party sites that integrate our social plugins. If you are a Facebook Page administrator, cookies allow you to switch between posting from your personal Facebook account and the Facebook Page. We use cookies such as the session-based "presence" cookie to support your use of Messenger chat windows.

• For example: We store information in a cookie that is placed on your browser or device so that you will see the site in your preferred language.

Performance

• For example: Cookies help us route traffic between servers and understand how quickly Meta Products load for different people. Cookies also help us record the ratio and dimensions of your screen and windows and know whether you’ve enabled high-contrast mode, so that we can render our sites and apps correctly. For example, we set the "dpr" and "wd" cookies, each with a lifespan of 7 days, for purposes including to deliver an optimal experience for your device’s screen.

Analytics and research

• For example: Cookies can help us understand how people use the Facebook service, analyse which parts of our Products people find most useful and engaging, and identify features that could be improved.

Third-party websites and apps

If you have a Facebook account

• You can use your ad preferences to learn why you're seeing a particular ad and control how we use information that we collect to show you ads.
• To show you better ads, we use data that advertisers and other partners provide us about your activity off Meta Company Products, including websites and apps. You can control whether we use this data to show you ads in your ad settings.
• The Meta Audience Network is a way for advertisers to show you ads in apps and websites off the Meta Company Products. One of the ways that Audience Network shows relevant ads is by using your ad preferences to determine which ads you may be interested in seeing. You can control this in your ad settings.
• You can review Your activity off Meta technologies, which is a summary of activity that businesses and organisations share with us about your interactions with them, such as visiting their apps or websites. They use our Business Tools, such as Facebook Login or Meta Pixel, to share this information with us. This helps us do things such as give you a more personalised experience on Meta Products. Learn more about your activity off of Meta technologies, how we use it and how you can manage it.

If you have an Instagram account

• You can use your ad preferences to learn why you're seeing a particular ad and control how we use information that we collect to show you ads.
• To show you better ads we use data that advertisers and other partners provide us about your activity off Meta Company Products, including websites and apps. You can control whether we use this data to show you ads in your ad settings.
• You can review Your activity off Meta technologies which is a summary of activity that businesses and organizations share with us about your interactions with them, such as visiting their apps or websites. They use our Business Tools, such as Facebook Login or Meta Pixel, to share this information with us. This helps us do things such as give you a more personalized experience on Meta Products. Learn more about your activity off of Meta technologies, how we use it and how you can manage it.

Everyone

More information about online advertising

• Digital Advertising Alliance
• Digital Advertising Alliance of Canada
• European Interactive Digital Advertising Alliance

Browser cookie controls

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• Safari Mobile
• Opera