Your best bet on Facebook is to provide good quality, entertaining, relevant and productive content to your fan base.

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Their economies were less productive, so they lacked the tax base needed to sustain modern armies.

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Members of the most productive teams can add 60% to their base pay.

ECONOMIST: South African gold mining

Leading the bunch is Minnesota's Justin Morneau, whose .342 batting average, 18 homers and 1.056 on-base plus slugging percentage (OPS) makes him baseball's most productive player during the first half of 2010.

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Irrigated rice-farming, which is two or three times more productive than the rain-fed sort, is growing rapidly throughout the basin, albeit from a low base.

ECONOMIST: The Mekong river