Tagging can be quite useful if used correctly. It can help make researching easier for people who are looking for a specific topic. For instance, if you search something on Google and go to a site that comes up, there may be tags on that site so you can click on those and find other similar sites that are based on the subject. On this site, if you tag a blog post, you can click on a tag and it will show other posts that mention same subjects. Tagging is quite useful for everybody.
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