If you have bookmarks and publications, that you want to share with specific people only, you can define them as being your friend (on the friends page). Then you can post selected bookmarks and publications to your friends only.
Today we added some more functionality for groups. On the group page you can now see all users which are in the group. This behaviour can be controlled by the group admin on the settings page. Furthermore the group admin can now remove users from a group -- all posts of the removed user which were viewable for the group members become automatically "private". So nothings gets lost. We also enhanced prev/next navigation and added a counter to the search page.
Improved group functionality added: now it is possible to get an aggregated view on the group members content via /group/* pages. Additionally, the tag filter is now case insensitive and you can jump to the page for the first filtered tag by just pressing return; broken bibtex URLs are now repaired on the fly and not in the database.