FarmVille, the massively popular Facebook game, surpassed 80 million monthly active users this week (source: AppData). Facebook has around 400 million users in total.

FarmVille has been a breakout hit, with its active user count growing by around 10 million users per month. Note that this isn't simply signups: This is a count of people using the app at least once in the 30-day span.

FarmVille's daily active user count is currently 29.7 million — that's almost 30 million people using FarmVille every day.

FarmVille's parent company, Zynga, was valued at 1 billion dollars late last year.