Snapchat is bringing groups to stories. The Story feature, which lets you take a collection of photos and videos, jazz them up with text and graphics, and send them out to specific friends for a 24-hour period, added a dose of cooperation on Tuesday. A new feature, custom Stories, will allow collaboration with friends and family for group stories, which Snapchat parent Snap says is "perfect for a trip, a birthday party, or those new baby Snaps for family members across the country."