Truth to be told.
Similar to Google aggregating links that were originally created for taking readers from one document to another, Del.icio.us can aggregate tags in order to find out how people value content. If 1,000 people save and tag the same bookmark, for example, that’s a good sign that they find value in it. But to think that people tag so that this information can be aggregated is to give people a trait of altruism they just don’t possess.
Truth said. Especially when it comes to Technorati Tags I could never really find a reason why to use them and the explanation in that article makes perfectly sense.