Inside Wikipedia
On data independence

SPURL streams

LIBRARY STuff -- Spurl is like Furl and in that you can save and correlate groups of links. Spurl has something distinct--it can cluster groups of like-minded links in an online bookmarking collective. It's explained well on the site. Plus, you can syndicated your streams. streams are a new and improved way for publishing spurls and working together in groups, gathering links on a given topic. A user can create a stream on any topic and allow others to contribute to the stream. When creating a stream, a user connects one (or more) of his existing categories to the stream. All spurls to that category there after are added to the stream.

There are three types of streams: An "Open" stream allows any user to join as a contributor without anybody's permission. A "Limited" stream requires an approval from the stream owner before a user can become a contributor. A "Closed" stream does not accept any additional contributors.

When a user joins as a contributor, he or she can connect (one or more) existing categories to the stream, or have create a new category that is automatically connected to it.

Within a stream, anybody can view the spurls, sort them by date, title or popularity and search them, using all the same advanced possibilities as available when searching one's own spurls. This can make a well-crafted stream a highly valuable resource about a given topic, allowing its contributors to build an advanced search engine with custom, hand picked content.

Spurl has "free online bookmarks with much more."
Steven Cohen -- " streams"