Personally I'm not a fan of some of the folksonomy sites. Of course they can be valuable in finding information because you can see what other people have found to be valuable. My main problem is with flickr.com. Flickr allows the user to tag the picture with what he or she thinks the picture's tag is. People can tag their pictures with random tags that don't fit, making this very similar to google.com picture search. I feel that google is actually better for pictures than flick because flick only contains user uploaded pictures, so that eliminates cartoon renditions of pictures, computer generated pictures and certain categories of pictures such as space or ocean life.
 

I think you're kind of missing the point. Google gives you access to anything on the Internet, which is great if that's what you want. Flickr allows people with common interests to easily share those interests through the use of tags and comments. It's much more social than the whole wide Internet, and that's what folksonomy is about - helping people connect around areas of mutual interest.