Tagging has been around a while now, but we still don’t seem to know what it is. Some people argue that it is the complete opposite of categorizing, while some believe that tagging shares much with categorization. I go even beyond that, and I have argued in several publications that rich structural information can be extracted from tags, if we know where to look.
But why does it matter what tagging is? Can’t we go on tagging even if we don’t really know what we are doing? (Works well in the rest of our lives!)
Well, yes, we could go on tagging. The question is what to do with the tags once we have them. If tags are really not categories, and if the extreme view is right that they are simply some sort of completely individualistic associations, then it seems to me that we can’t do ANYTHING with them across the user base. If on the other hand there is some agreement between users about basic categories at least, then we should be able to aggregate them accross users and use them in interesting ways.
The fact that we already do aggregate them and interesting patterns of popular tags can be found, suggests to me that the extreme view against tags as categories must be wrong.