Thing is, we already know who read your post, we track it.
An extension could possibly surface that information in a aggregate way, eg: 30 users read this post. It does feel a bit like info porn to me.
I don’t know, I haven’t run across this yet, as you say it may be cultural. If I like something, well I would like it. If its really critical for me that @codinghorror read it, I would ask for an explicit response.
The vast majority of over “chattiness” is mainly people neglecting to use the “like” button, sometimes cause they want 17 flavors of like, and the one on offer is too general. Sometimes they simply have not discovered the like button.
Keep in mind, we are trying to encourage conversation here, what would seem like chattiness in the Stack Exchange land, is often perfectly valid here.