This article suggest part of the appeal is that many teens are more uncomfortable in face to face interactions:

http://altoonamirror.com/page/content.detail/id/546223/Face-to-face-communication-not-always-comfortable-for-teens.html?nav=742

and this one looks at how use of these devices has become the norm:

http://www.thesunnews.com/2011/01/16/1918376/devices-rite-of-passage-for-teens.html

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