Is there any possible way to follow a tag or category?
If not, how do i put in that feature request?
You can follow tags, but as far as I know not categories.
To follow a tag, you will need to select (or create) a Stream in which you want to follow it, then edit the stream and add the tag to follow.
Still is not possible to follow a category, but here is the idea if you want to up vote it.
Track and Follow Categories (formerly also Following Tags, which is now supported)
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