In order to explain this choice succinctly, we now show you the following message when you sign in to Medium with DNT settings enabled or in a private browser window:

You have Do Not Track enabled, or are browsing privately. Medium respects your request for privacy: to read in stealth mode, stay logged out. While you are signed in, we collect some information about your interactions with the site in order to personalize your experience, offer suggested reading, and connect you with your network. More details can be found here.

Twitterは、ブラウザの「Do not Track (トラッキング拒否)」機能を尊重し、Twitterのユーザーエクスペリエンスや広告表示のカスタマイズにユーザーのウェブサイトアクセス情報がどのように使用されるかをユーザー自身が制御できるようにしています。

TwitterはDo Not Track(トラッキング拒否)のブラウザ設定のサポートを終了しました。業界におけるDo Not Trackの活用促進を目指してTwitterはDo Not Trackをサポートしていましたが、Do Not Trackに対する業界の足並みはそろいませんでした。

従来、Twitterではブラウザー設定「Do Not Track(トラッキング拒否)」を利用してきましたが、これらの新しい設定がトラッキング拒否に置き換わるため、今後はトラッキング拒否がサポートされなくなります。

Microsoftは今回の方針変更について、「われわれの方針がW3Cの標準に準じていないのではないかという誤解を排除するため」と説明する。

However, having said that, most email apps (desktop clients) do not support any form of Do not track (DNT) but our systems are ready when that support is available.  DNT is primarily a web-based technology today and only really works with web-based email services (Yahoo, Outlook.com, etc.)

A note about Gmail.  Google recently introduced an image proxy for Gmail's web-based email.  Google doesn't currently appear to pass the DNT header to us.  When this is available, our DNT support will kick in.

Also in the future, we plan to add a facility on our website where people can opt out of all tracking by providing us their email address.  We hope to have this shortly.

momit has adapted its website to the standard Do Not Track to ensure privacy for users who have activated this option in your browser.

We honor do not track signals and do not track, plant cookies, or use advertising when a Do Not Track (DNT) browser mechanism is in place.

Please note that our websites may not recognize or take action in response to DNT signals from Web browsers. At this time, there is no universally accepted standard for what a company should do when a DNT signal is detected. In the event a final standard is established, we will assess how to appropriately respond to these signals.

We honor do not track signals and do not track, plant cookies, or use advertising when a Do Not Track (DNT) browser mechanism is in place.

Removed support for the expired Do Not Track standard to prevent potential use as a fingerprinting variable.

Since its last publication as a Candidate Recommendation, there has not been sufficient deployment of these extensions (as defined) to justify further advancement, nor have there been indications of planned support among user agents, third parties, and the ecosystem at large. The working group has therefore decided to conclude its work and republish the final product as this Note, with any future addendums to be published separately.

3. はてなでは、ブラウザの「Do Not Track(トラッキング拒否)」 オプションをサポートしていません。