Google+/circles

page type::subpage thing type::user guide subject::Google+ circles

Circles make these things possible:
 * I can categorize people I follow
 * I can choose a particular category of people to "read" at any given time
 * I can choose a particular category of people to be allowed to view a particular post
 * I can choose a particular category of people to notify of a particular post

What they don't let you do:
 * categorize particular posts (so you don't have to include or exclude everything someone lets you see)
 * let people categorize themselves (so they can determine which of my posts they want to see)

This missing functionality is more or less equivalent to "groups" on Facebook.