You're either repetitive, bored, or urgent JUN 18 2010
Google breaks down mobile device users into three categories: repetitive now, bored now, and urgent now.
The "bored now" are users who have time on their hands. People on trains or waiting in airports or sitting in cafes. Mobile users in this behavior group look a lot more like casual Web surfers, but mobile phones don't offer the robust user input of a desktop, so the applications have to be tailored.
The "urgent now" is a request to find something specific fast, like the location of a bakery or directions to the airport. Since a lot of these questions are location-aware, Google tries to build location into the mobile versions of these queries.
This works for general web users as well. Blogs do well when they appeal to repetitive now and bored now users, but the really effective ones target all three types at once. Somehow this is related to stock and flow.