What are groups?
Groups are an easy way to share content and conversation, either privately or with the world. Many times, a group already exists for a specific interest or topic. If you can't find one you like, feel free to start your own.
How do groups work?
Groups can either be public, restricted (users may read a brief description or overview but not view content) or completely private. Every group has a wiki, a pool for resources, and a discussion board for talking.