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This is like saying Twitter is liable if you tweet your own status.

That's not even close to the same thing. You're comparing involuntary and unknown sharing of personal data with explicit and self-actioned sharing of that data.

The user volunteers their health information into the public domain when they tell Grindr their HIV status. This is information that is already visible to other users to some degree.

Declaring your HIV status on Grindr is voluntarily and knowingly sharing your own health information into the public domain. It is much closer to tweeting it out than telling a medical professional imo.

Valid point; I hadn't considered it that way. There's still a large difference in audience between the two but ultimately you're surrendering the information to unknown parties.

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