When you invite someone to contribute to your collection anonymously, they will have the option to add a sub-collection without creating a Wakelet account. A link to this sub-collection will be kept in the main collection you invited them to. 

Create a Sub-Collection

• Join a collection anonymously via QR code, 6-digit text code or link. 
• Click the '+' button. 
• Select 'Create Collection'. 
• Give your collection a name and cover image
• Click 'Done' to go back to the main collection, or 'Edit Collection' to start editing your sub-collection.