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The tagging features of flickr have taken the next step- elevating results of a display of shared photo tags to other relavant tag sets (see tag relatedness features).
For example, the flickr wide tags for where I am right now to more specific results as well as related topics. How does it do this? You have me, but from my own I think it is doing some matching based on photos with multiple tags applied.
Now one can take one varied paths in flickr-space. Starting at the kind of plants in my front yard leads me to a country where the plants are "spicier" to kinds of places you might stay while traveling to where I might end up at the end of the night to what I definitely am not a fan of to...
This is pretty wild. I just love flickr. I do.