telegram.org/blog/unsend-pr
Gaslighting as a first class feature:
"Now you can “unsend” messages you have received as well, and there is no time limit. You can also delete any private chat entirely from both your and the other person's device with just two taps."
That's a bit odd.
Conversation
To be fair there are some positive uses for that, but being able to delete someone else's record of a conversation within the app is also very weird and easily abused. Send someone an abusive message and delete it. Delete someone's message and claim they never sent it. And so on.
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I think you should be able to delete them up until the point that the other person has seen them. I don't think it needs a specific time limit. The other people could take a screenshot of it immediately if it was something sensitive or embarrassing. It's too late at that point.
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That's true, but I don't think deletion should be possible once there's a confirmation that it has been seen, including interaction with the app, and being able to go back deep into the history to make deletions is an extreme violation of that.
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I still don't think you should be able to delete a message that has definitely been seen, without the consent of the person receiving it. A feature for that definitely plays into the hands of abusers. A time limit doesn't really change much.
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By that point the past evidence can already be maliciously deleted though, without you even realizing they were actively deleting old messages from the discussion. I really don't like the feature.