A Discussion Stream provides a platform for all the members to collaborate and start discussions. In the Discussion area, the discussion topics to which you have access are displayed. The New section lists any new topics that are created. You can also search for discussions that you are interested in and join those discussions. The Discussion and Timeline features are tightly integrated so that updates about any posts added to a discussion you are a part of are shown on your timeline.
To navigate to the Discussion area, in the top navigation bar, click Discussion. You can perform the following actions on a Discussion Stream:
Create
Edit
View
Join
Leave
Delete
For detailed instructions, see the Yellowfin documentation at Discussion Streams.