The Social Stream module allows seamless communication, collaboration, and social networking among project team members. Team members can now easily share ideas, opinions, comments or messages by subscribing to social streams. You can also view timely user and system generated news, alerts, notifications, and comments associated with your projects.
To subscribe to a Social Stream:
From the listing pages (Project Listing Page, Proposal Listing Page, and Ideas Listing Page), the Social Stream page, or from the Project Basics page, click the 
icon next to a project, proposal or idea. The star turns yellow
indicating that you have successfully subscribed into its social stream.
To un-subscribe from a Social Stream:
From the listing pages (Project Listing Page, Proposal Listing Page, and Ideas Listing Page), the Social Stream page, or from the Project Basics page, click the icon next to a project, proposal, or idea. The star turns gray to show that you have un-subscribed from that social stream.