You can browse all the published concept maps without signing in. If you'd like to create your own concept maps, all you have to do is
sign in with Twitter.
The collection bucket for everything you have committed to read or review.
Any set of similar items. Examples include:
Something you have made a commitment to read or review that will take more than 2 minutes. Examples include magazines, proposals, brochures, etc.
The set of things you need to discuss or progress with a given stakeholder.
A system of classifying into files (usually arranged alphabetically)
Everything that enables you to empty your head and keep things off your mind.