If 90% lurk, 9% comment/engage and 1% create, does that mean that only 1% of people need a full function PC with a full function keyboard and mouse, the 9% can get by with the cut down apps on tablets with an occasional keyboard or a chromebook, and the 90% only need a smart phone and an onscreen keyboard.
Except: http://gigaom.com/2012/05/06/bbc-1-percent-rule/