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Jeremy Wagstaff’s column in today’s The Wall Street Journal has the clearest explanation I’ve seen on the use of tags.
About a year ago, Flickr a Web site for storing your photographs; and del.icio.us, which lets you store bookmarks to your favorite Web pages, started letting users add tags (also referred to as “folksonomy”) to what they are storing, and by default share that data with any other user.
This month, Technorati started using tags from Flickr and del.icio.us to categorize the millions of blogs it indexes.
Bottom line: if tags catch on, the Internet it could become a lot easier to find relevant search results.
Right now, bloggers who use technorati tags get primo placement on the technorati pages coresponding to the tag because Moveable Type has incorporated the tags into its blog software.