You’ve been thinkink that del.icio.us or Flickr invented “tags”. You fool.

Websites have been tagged for years. Remember, the little <meta name="keywords" content="foo, bar, stuff" /> bits of code? It is tagging. Yeah, it is.

Modern web applications such as del.icio.us, Flickr, 43things or Technorati are just using an old thing. They are putting keywords (now called ‘tags’) on smaller elements than a whole website, like pictures, weblog posts or hypertext links.