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Re: Logging out from Facebook

From: Thomas Roessler <tlr@w3.org>
Date: Mon, 26 Sep 2011 12:27:28 +0100
Cc: Thomas Roessler <tlr@w3.org>, Noah Mendelsohn <nrm@arcanedomain.com>, Karl Dubost <karld@opera.com>, Jeni Tennison <jeni@jenitennison.com>, "www-tag@w3.org List" <www-tag@w3.org>
Message-Id: <C2792933-8F76-48CC-8BFC-9F70403A7477@w3.org>
To: "L. David Baron" <dbaron@dbaron.org>
On 2011-09-25, at 18:59 +0100, L. David Baron wrote:

> That said, I keep hearing about how sites are or may be using other
> methods to track users (flash local shared objects, fingerprinting),
> possibly in combination with each other.

There are significant pieces of today's Web Architecture that depend on keeping a certain amount of client state  in-browser caching comes to mind as a rather fundamental example.

If there is sufficiently high-entropy client side state, and if that state can be accessed by a web application (using JavaScript code or HTTP or something else), then tracking is technically possible.
Received on Monday, 26 September 2011 11:27:45 UTC

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