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The mother, Alexandra V. Tobias, was arrested in January and declared her plea on Wednesday before Circuit Judge Adrian G. Soud, The Florida Times-Union reports.
She told investigators that she shook the baby, smoked a cigarette "to compose herself," and proceeded to shake him again. The baby may have hit his head during one of the two shakings, she said.
FarmVille, named one of the "worst inventions" in recent decades by Time magazine, has more than 60 million members, most of whom access the game through Facebook. Some players have found it so addicting that they've lost their jobs and racked up debts north of $1,000.