
Originally Posted by
TopDogger
Changing from underscores to hyphens will probably not increase your traffic that quickly for existing pages, but it may help new pages.
It can reinforce the themes for the pages, so it is possible that new pages are showing a better focus on your search phrases.
According to Google, using hyphens will not help your rank positions, but it does help spiders determine the theme for each page. That alone should strengthen your initial rank positions, so the two statements are a bit conflicting.
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