It's currently not possible on kbin.
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Thanks! I don't mind waiting for the features to be developed - I just wanted to make sure it wasn't already there and I was overlooking something.
On Kbin, if you click the microblog tag from within a certain community it will narrow down the list of posts you're seeing to something more topical. It may not be exclusive to the tag you're looking for, but it would most likely be related.
E.g. If you go into a magazine devoted to puppies and from within that, you click the microblog tab. You will see a feed of puppy related posts.
If you select from the main Kbin instance, you will see a more varied selection.