del.icio.us covers new ground in social software, as it focuses primarily on sharing bookmarks. Anyone can search the quickly-loading website to get a very live scan of what webpages people are noting. If you register for the web application (free, quick, easy to do), you can do some interesting things:
- Stash and publish the URLs of Websites you find interesting for whatever reason. You can also mark up each bookmark with descriptive text. del.icio.us also lets you generate categories, or tags, which appear with URLs, and are presented in addition to your sites.
- Subscribe to others' delicious sites, RSS-style. This automatically creates an aggregated URL feed, or inbox. You can let other subscribe to you, too, of course. (Here's mine)
- Friend of a friend URL searching. When you read through the lists of websites, either on the deli front page or in your inbox, each listing includes the name of which delicious user(s) posted it there. This lets you check out who's posting an interesting site, in case they have others interests like yours. Following their tags and inbox may lead, FOAF-style, to other people pursuing such topics, and so on. (It'd be fun to see how often this happens, and how far it goes)
I can imagine some educational and knowledge management applications for this tool. An expert maintains a bookmark list this way, for example, as a way of sharing their current resources and interests. Students in a class could create and subscribe to each others' feeds in order to grow a research project's web resources. A firm could see which tags emerge over a period of time, in order to generate or adjust an internal ontology.
More, delicious is a treat to use. The site is clean and fast-loading. Somehow it manages to be fun, too, which isn't what "shared bookmarks" suggests. But it's fun to see what others are looking at around the world, and to explore these other people and their thinking. This partakes of the exploratory pleasures we once found in social applications like Friendster and Orkut, and succeeds by being so limited (compare with Flickr).
Bonus: the site encourages hacks and implementations, like the tag visualization tool we noted last week:

Keep in mind this is a site in development. Some issues I'd love to see addressed:
- URLs appear in a bloglike structure of reverse chronological order. Good for news and updates, but not for other organizational frameworks. This is alleviated by easy search and tagging, but that doesn't solve this presentational problem. There should be a way to present one's links in other orders (please comment if you can do this). For example, I've found it useful to maintain an HTML bookmarks list in categories arranged in alphabetical order. Could we push tags to the left?
- Can multiple people author one feed, as a group site?
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