Groups are the foundation of Cohort — clubs, orgs, teams, or just the people you already know. Create one, invite people you follow, and control exactly who can see it, post in it, or get tagged in it.
Name it, add a photo, and set who can see it — open to your campus, or invite-only.
Add members directly, or open the group up so people on your campus can request to join.
Break a larger group into smaller subgroups — a chapter into pledge classes, a team into travel squads — that live right under the main group with their own chat.
Posts, event invites, and merge requests all stay scoped to the group they belong to, with per-group notification controls.