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Oops. Now look what I did, pointing out that tags were basically subreddits already... :P Seriously though, I like the speed of change here, and unshared should encourage more discovery and sharing. On the other hand, taking away tag-following without replacing it with this mysterious new functionality will probably reduce discovery for a time, unless people start using popular and unshared more as a result. I look forward to seeing what the new features will be.