Facebook users have another reason to celebrate as one of the most-loved games in the world; Angry Birds is now available in the social networking site.

Rovio, the Finland-based game developer behind Angry Birds was scheduled to launch the game during Valentine's Day but ended up releasing it a little bit early than what was originally planned. The launch was regarded as a Facebook Event entitled "Angry Birds coming to Facebook!" This recently released Angry Birds game is considered as the "upgraded" version because of the new enhancements in various aspects of the game like special effects like lighting, smoke, and explosions. As with any games in any social networking site, users could "share" or brag their achievement to their friends as well as invite them to play the game.

The Facebook version utilizes Flash Player 11 with support for 3D graphics. Adobe described this version as "the most social version of Angry Birds yet that takes advantage of hardware accelerated graphics in Flash Player to bring a silky smooth gaming experience to a wider audience than ever before". The game is offered for free but there is a charge for availing of "power-ups" which offers additional features when playing the game. At first try, these power-ups are free of charge but once it is already used up, users have to pay US$1 for 20 uses.

Here is the official description from Rovio's website regarding the power-ups available in the Facebook version of Angry Birds:

In addition to the Mighty Eagle, we have great new power-ups to help you pop even the peskiest piggy. In Angry Birds Facebook, you have the opportunity to earn power-ups by playing the game, receiving them as a "mystery gift" from a friend, or purchasing them. To begin, there are four amazing power-ups available:

Sling Scope - Looking for the perfect shot? Use Sling Scope laser targeting for pinpoint precision!

King Sling - Fling your birds with style AND speed. Upgrade to the almighty King Sling for maximum power and velocity!

Super Seeds - Supersize your bird! Super Seeds turn any bird into a pig-popping giant.

Birdquake - Rattle the battle! Use the Birdquake to bring pigs' defenses crashing to the ground!

Angry Birds is considered as one of the most popular games released and it was made available in various platforms including iOS, Microsoft Windows, Symbian, Mac OS X, Android, BlackBerry Tablet OS, Windows Phone, WebOS, Maemo, PlayStation Portable, PlayStation 3, WebGL, and Google Chrome. Once the popularity of Angry Birds soared, there have been talks before of making this game available for Facebook users. Currently, the game's Facebook Page has 15.4 million "Likes" and it is reported that Rovio is aiming for 800 million users worldwide.

Angry Birds in Facebook could now be accessed through this link: apps.facebook.com/angrybirds/. There could be possible issues when using Internet Explorer 8 or earlier browser versions but Rovio assured users that they are currently working to fix these issues.