It's pretty easy to understand why typing isn't exactly an optimal experience on a smartphone. They are designed to fit in palms and come with virtual keys smaller than the fingertips used to press them. Tablets don't suffer from this problem, but they come with one of their own - a user can type speedily using the significantly larger keys, but resting their fingers on the screen for a mere second is all it takes to turn "superpower" to "sauerkraut," and suddenly that status update about whether America should get involved in Syria accumulates a different flood of Facebook comments than was expected.

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