Meet the Online Tracking Device That is Virtually Impossible to Block

Like other tracking tools, canvas fingerprints are used to build profiles of users based on the websites they visit — profiles that shape which ads, news articles, or other types of content are displayed to them.

But fingerprints are unusually hard to block: They can’t be prevented by using standard Web browser privacy settings or using anti-tracking tools such as AdBlock Plus.

via Meet the Online Tracking Device That is Virtually Impossible to Block – ProPublica.

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