Amusingly people will still happily tweet and post to facebook.

Yes, it's a bit daft of Apple to allow that level of caching, but real world impact... not so much.
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Rory
MkIIa, blue lit buttons, memory upgrade, 1Tb in Subaru Forester STi
MkII, 240Gb in Mark Lord dock
MkII, 80Gb SSD in dock