I must confess to using Del.icio.us an awful lot but rarely by actually going to the website. The reason is simple, the Del.icio.us Firefox extension encapsulates browsing, bookmarking and tagging into a seamless workflow. I installed the Del.icio.us Facebook app almost a year ago. At first it did not seem all that useful - My recent bookmarks were displayed on my profile page and recent bookmarks of my friends were displayed on my homepage. I find myself these days clicking on some of the recent bookmarks made by my technically minded friends. Facebook coupled with Del.icio.us is actually a very subversive way to gain an insight into what your friends/colleagues are working on, researching or investigating. I’ve become a bookmark spy!