Using Zotero to work collaboratively with colleagues and to share your research sources with the world is easy using Zotero Groups.
Group Types & Access:
You determine the level of visibility and access others have to your new group. Groups can be either Public or Private. Public groups can be open to anyone or by invitation only. Private groups are strictly visible to collaborators you invite to join your group.
To join an existing group, use the Search feature to find groups your interested in joining.
Zotero's Groups feature allows you to share references with other Zotero users online. It's a great way to work on collaborative research projects.
You now have two sections in your Zotero collections pane: My Library and Group Libraries.
Personal and group libraries are entirely separate, and changes made to items in one library do not affect the other. You can drag items back and forth libraries to copy items.