"What's the most popular video game these days? If you think it's Halo: ODST, Batman:..."

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What's the most popular video game these days? If you think it's Halo: ODST, Batman: Arkham Asylum or Wii Fit, think again. While high profile console games are hogging the consumer spotlight, Zynga's FarmVille - a free-to-play Facebook game about tiling soil and tending crops in a virtual farm - has quietly amassed more than 58 million active players.

For anyone counting, that number easily surpasses the sales figures of the best-selling console video game of all time: Nintendo Wii...