One idea begets many comments. Comments beget a network, networks beget collaborative webs.

Many ideas beget many new comments, they in turn beget new decisions and new content. This you can supply with tags to help search and find. You may collaborate in real time - or not.

Content is limited only by laws of physics. If you can digitize you can create, share, remix and redistribute. Read stuff on copyright.

Documents, music, photos, drawings, movies, programs, notation, web 2.0 … try internet search with these words and add “online”, “service” and “open source”.