From at least three friends on Facebook:
WASHINGTON (AP) — The people who multitask the most are the ones who are worst at it. That’s the surprising conclusion of researchers at Stanford University, who found multitaskers are more easily distracted and less able to ignore irrelevant information than people who do less multitasking. [24 August 2009]
Actual article abstract: Cognitive control in media multitaskers Eyal Ophira, Clifford Nass and Anthony D. Wagner. Proceedings of the National Academy of Sciences, posted online 27 August 2009.
This could explain a lot.