I also haven't found a way to turn it off. | Hacker News

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		mayneack on May 16, 2012 \| parent \| context \| favorite \| on: Facebook now informs the sender if you've read the... I also haven't found a way to turn it off.

eblackburn on May 16, 2012 [–]

I think I read somewhere that FB embed sound tags in their html to simulate the images trick.

mike-cardwell on May 16, 2012 | [–]

Yes, they use the bgsound tag. That's one of the many tests that the Email Privacy Tester uses: https://emailprivacytester.com/

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