Or we could use both. The thread prefix for parent categorization (a look at Amazon.com for useful parents could help here); the tags for more detailed information/categorization.
The problem with choosing tags alone is that there is no control over how we tag a thread. You could tag a thread with mystery, thriller, suspense, whatever, essentially meaning the same. Misspellings would be possible too. This would cause ambiguity.
You can filter threads by thread prefixes; you cannot do this with tags. On the other hand, tags are searchable, but so are threads prefixes.
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