It makes searching more accurate. Tags are "keywords" for posts. The more tags that match the search query, the more likely it is that you'll be able to find a relevant post. Also, if you see a tag and click on it, you can find other posts with the same tag - which makes browsing for posts easier.
I find that most people don't take advantage of tags for forum posts, but they do for blogs. I think it's a pretty good move to turn them on.
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