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Yeah I search them, one of the dapps I helped get online uses them as its primary way of finding specific content. Hivehound lets you filter by tag and other important details. Without its tag search it would only be a shadow of what the dapp could be.

Interesting, cool! I'd love a way to filter a feed by new posts where they only used tags, i.e. no community.

Tags could be important for some cases where curators curate based on specific tags. I also click on tags to see what else is interesting on that specific subject that sometimes is not posted in the community that I follow.