Is del.icio.us dan.gero.us?

This is a rather odd post from one of the team at Cogenz a social bookmarking application. In it they reference another post "An introduction to Enterprise 2.0" which says;

"Marketing teams could use social bookmarks for competitive analysis to track what a competitor is doing; Sales could use it to learn and share information about targeted companies; knowledge workers could use the technology to track a particular subject such as Exchange Traded Funds or cell phones. What’s more, people can share these lists, and the data lives on even after an employee leaves the company."

I guess the point that is being made is that these links are then "public" and accessible by all, but then isn't most information on the Internet. The second question which is reiterated in a comment about the post is how many people, knowledge workers, marketing teams are actually doing this, probably very few.