Hubski is trying to straddle some sort of in between territory and it's doing a bad job of it at the moment, as far as I can make out. If tags could be nested somehow and content out of lower tags bubbled up into higher tags once they got popular enough, maybe... ( #nfl having 32 team tags under it, and when content for a particular team has enough interest it would "overflow" to the parent tag; you'd need multiple inheritance to also have teams linked to their local area - if the Blackhawks win the Stanley Cup it should show up directly from #chicago even if it's not tagged chicago directly.)

This is the main problem I see as well. I feel with without nested tags, you would need to follow an absurd amount of tags. Another solution would be to allow a huge amount of tags on a post, which could work, but I feel like using tags allows for certain areas to be isolated because the tag needs to grow in the first place for someone to recognize it enough to use it.

Another problem is how would I post a link that's very relevant to many tags? Using the Blackhawks example again, it could go to #nhl, # chicago, #Blackhawks, #sports, #hockey, the list goes on.