It is possible to collaborate with others by using the Browse Activity. You do this through sharing bookmarks.
To share a bookmark with others in your Neighborhood View you must have already stored some bookmarks within your Browse Activity. If you have done this then visit the Activity tab at the top right of the Browse Activity:
You now see an area next to the text "Sharing" - you click this and choose "My Neighborhood":
Now all those in your Neighborhood can access your bookmarks.