How does "publish read state" work?

[Roman (Roman Rizzi)]

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When in a group, knowing if another user reads a message can be quite useful. A couple of months ago we added the experimental “Publish read state” feature, which after a lot of tweaks is now ready to be safely used. As you may have noticed, this shows who read which post. It adds a new icon and the reader’s count just before the likes: [Screen Shot 2020-02-27 at 15.03.02] If you click the icon, you can also see the reader’s avatars (it works the same way that likes). You will only count as a…