Thanks for the quick answer, @baris!
Regarding how it works in the front end:
If the user has permission to system tags, they will appear when entering the tag name (suggest search).
The system tags will not be visible to users that don't have permission.
Tag cloud is bad
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Citation needed.
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This is too general.
The tag cloud is like a link list.
First of all the tags should not be random and not too much as well.
It might appear that some tags are "useless".At the same time you can put useful and sensefull keywords into the tag cloud, helping users and Google and so your SEO.
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So why do you bring up tag clouds? Do you think the tags page should be changed or removed, or what?
The tag cloud on the home page of this forum is a small number of links. The tags page is a tag cloud, but it's not on every page so the same ideas don't apply as for sidebar tag clouds.
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Interesting, but two negatives mentioned, pagerank bleed and keyword stuffing, don't seem to apply to the small number of tags displayed on the homepage.