Silicon Valley warns of device addiction

NYTimes  Stuart Crabb, a director in the executive offices of Facebook, naturally likes to extol the extraordinary benefits of computers and smartphones. But like a growing number of technology leaders, he offers a warning: log off once in a while, and put them down. 

In a place where technology is seen as an all-powerful answer, it is increasingly being seen as too powerful, even addictive.

The concern, voiced in conferences and in recent interviews with many top executives of technology companies, is that the lure of constant stimulation — the pervasive demand of pings, rings and updates — is creating a profound physical craving that can hurt productivity and personal interactions.