Simsi - 11:54 am on Oct 25, 2013 (gmt 0)
The problem with "mobile" in my opinion is that the terminology is ambiguous. You can think of mobile as the device or as an action. If it's the action, the critical factor is as much about time as it is screensize. If it's the device, the critical factor may be less time-critical and more about screensize. "Useful" content will probably need to adapt to the situation to be useful.