Each website in the Network has its own Group or Groups. These cater to your personal interests.
When you join a Group you indicate your area of interest such as a model of keyboard or genre of music. The website will then show you more information that relates to your area of interest.
For example, the personal Activity Stream in your profile will show you topics you’re interested in. Some Groups also have associated Forums, and you will see Topics from your Group Forums in your Activity Streams.
Joining a Group opens up additional features to you, such as being able to respond to conversations directly in the Activity Stream.
Press the ‘Join’ button on any Group to join.