According to IDC, worldwide media tablet OS rankings for Q4 2011 look as follows:
Apple iOS: 54.7% (down from 61.6% in Q3 2011)
Google Android: 44.6% (up from 32.3% in Q3 2011)
HP webOS: 0% (down from 5% in Q3 2011)
RIM Blackberry: 0.7% (down from 1.1% in Q3 2011)
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