Is Del.icio.us Tasty or Not?

I can see where this site can be a great asset for research, in that you can access this site from anywhere and would then be able to view how many people are researching similar subject matter. This could lend itself as one more tool in a teacher's tool box. The students could view how many people are accessing sites of interest and have an instant count of the number of people at each site helping them learn which are the highly sought after sites and which sites would be of less value and not wasting their time to complete their research. I understand how this is a another way that the web 2.0 community can interrelate on a myriad of subject manner, but I'm old school leery of how much to share and when enough is enough.