Collaboration is powerful and while Saganworks does not currently have collaboration features in the truest sense (we will one day!) here is what you CAN do to collaborate while in a Sagan:
Ask yourself, do you need to both be able to edit the SAME space at the SAME time? Or can collaboration exist across multiple spaces?
Can one person share their screen and collaborate verbally while only one person edits the actual Sagan?
To share a Sagan with someone else to view, you can share a read-only copy via email. If you find that multiple people need to be able to edit the same space, there is always the option to share your login credentials. Just make sure to have each person log in and edit the space at a different time so that no changes are lost.
There are also some great options leveraging screen sharing tools like Google Hangouts and Zoom to use Saganworks in guided discussion. Here's an example of using Saganworks as a hub for content and as a presentation tool for a collaborative group: