Participation is always as a member of a group. Groups join together in the Order Out of Chaos discussion, where each lunar month, rating results are available local to global by gender and age.
Also useful to know:
If in expert mode, you can change the group by using the menu on the left. If a group belongs to a discussion, there will be a discussion button at the top of the group page. You are encouraged to rate the messages for interest and approval. To expand a message, click the message title or the + sign.