Think of groups in the Friendclips app like your different groups of friends and people you know in real life. You can assign friends to color coded groups (friends, team, classmates, co-workers, etc.).
Groups are displayed at the top of the screen. Tap a group to see videos of the people in it, or swipe left and right to move from group to group. They will show up on a screen with a background the color of the group.