@trwnh A common sort of blog post is a review, sometimes of a post on another blog. They typically include links, quoted texts, screenshots, or video clips of what is being reviewed, so you can understand the review without going directly to the material, but with the explicit option to do so.
A quote post on a microblog is like a review of another microblog post or thread.
As someone else said, it is a deliberate change of context, making it a special case of a reply.
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@trwnh A reviewer does not necessarily expect or want a direct interaction with the author of what is being reviewed.
The deliberate change of context is a weak partitioning of discourse. Particularly in a microblogging context, discussions can branch quickly and become very confusing, so partitioning discourses helps maintain coherence. That's likely to be even more important in a decentralized and federated model.
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