[p4r4d0x]

Sounds rather like Delicious, just with privacy restrictions. Although, I can see myself using something like this.

Here's what Delicious's FAQ (http://www.delicious.com/help/faq#network) has to say about it:

Can I share a bookmark with just the people in my Network?

No, bookmarks can only be public or private right now. We may add something like that in the future, though.

[sw1205]

That FAQ is almost exactly what we want to offer. I have completely different bookmarks at work to what I do at home. People at work would find my browser bookmarks really useful but some of these are sensative and have no place in the cloud. The idea therefore is to create a solution for this problem (if one does not exist already).