The two main roles for users in Flint are owners and members. A person can be a member in one group and an owner in another. And these roles affect their permissions in groups and activities (see here for more on groups and activities).

Members of a group can use any public activities made in the group they are in, or unlisted and private activities if they have the link or are invited to them, respectively. Members can also create and share activities.

Members can create subgroups within a group, where they will be owners of the subgroup.

Owners of a group can see group and activity analytics in addition to everything members of a group can do.

Owners of an activity can duplicate activities to share with other groups they are owners of.