What are Collections?
Say goodbye to folders — Collections are a flexible way to add a lightweight level of organization to your mems. Collections denote a group of mems, and you can use Collections by typing the # symbol followed by the name of the topic, or by using the "Add to collection" button at the top of a mem. If you tag multiple mems with the same Collection, they'll be grouped together, and you'll see that Mem pulls up related information about the Collection in the sidebar.