Diigo is an exciting tool for small teams that want to share bookmarks and collaborate.
Each user can not only bookmark pages on the web that interest them, they can highlight text, add sticky notes, and share with their group. You can also tag each post to search it easier.
While lots of bookmarking software will let you share with anyone, or keep it private, very few are good at letting you create a private group where each member can share and collaborate with other members. Additionally, if you want you can use the group widgets to automatically post your latest Diigo content into your website.