Chatter group types and member access
Key Takeaway
Public groups are open to everyone in the company, private groups are members-only for content, and unlisted groups are invitation-only. People outside your company's email domains are Chatter customers, and private and unlisted groups can allow them.
A Chatter group is a shared space where a team posts updates, adds comments, and shares files in one group feed. Chatter offers several group types so owners and admins can control who can find a group, who can join it, and who can post. What a person can do in a group depends on the group type, their role in the group (owner, manager, or member), and a few powerful permissions.
What a Chatter group is for
A Chatter group can be built around a team or a project, or around a topic or a line of business. Members use the group feed to share information, make decisions, and ask and answer questions.
A user can join up to 300 groups, and a company can have up to 30,000 groups in total.