LS97 really explained it well in this post:
LS97 wrote:
I think the purpose is to show that you agree that it's a valid tag.
Say, for example, that a shooting project was tagged with "shooter". If you [+] the tag, you're saying that it is indeed a shooter, telling the site to display it as a more relevant project when searching for shooter.
At least, that's how it's supposed to work...
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Wes64 wrote:
It encourages tag-spamming, that's what it really does.
Yeah.
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It's cool though
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