Start from a single topic and branch outward in three dimensions — search it, orbit around it, and keep adding until a tangle of small ideas becomes a map worth keeping.
How this works: public webs live on a shared server, so anyone signed in can browse and add to them — a real, growing, Wikipedia-style map of ideas. Private webs are stored the same way but only visible to their owner and anyone invited by share link, which makes them a good fit for a team, a class, or a project working together.