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.

First, set up Zotero sync as described on this page.

Next, log in at Zotero.org.

You can search for existing public groups or create a new group. There are three kinds of groups:

• Public, open membership (anyone can view the group online and join the group instantly)
• Public, closed membership (anyone can view the group online, but members must apply or be invited)
• Private membership (only members can view the group online and must be invited to join)

After you join or create a group, you'll have two sections in your Zotero collections pane: My Library and Group Libraries. You can drag items back and forth between them at will.