Rovio game on Facebook is free, but the manufacturer has created four different types of improvements related to the strength and agility of birds.
20 uses of a power-up Angry Birds Facebook will cost users one dollar, writes CNET. We'll see power-ups like birds on steroids, earthquakes, and more. The numbers in red below each icon means they'll be limited use. You'll be able to purchase power-ups for $0.99 or earn them via game play (how remains a mystery).
Unlike the Mighty Eagle, power-ups can be used to help pump up your scores, thus improving your ranking on the leaderboard. It also looks like you can use more than one power-up at a time.

Once you run out of your initial power ups you can buy more in the shop. There's likely a way to earn more as well. Plus, each time you log in you get a mystery prize. The more consecutive days you play in a row, the more prizes you get. Rovio has obviously studied other popular FB games.

Angry Birds for Facebook version uses Flash Player 11, offering enhanced effects during the game than other platforms.
Angry Birds is played daily by 130 million people globally and its appearance in the social network was delayed a year from the first negotiations between Rovio and Facebook.
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