The title finally made it to Facebook. The Angry Birds are finally here! Use power ups to supercharge your birds and pop pigs faster and better than ever before. Play to win and beat your friends' high scores in an intense competition for the coveted golden crowns! Nothing says "Happy Valentine's Day" like competitive pig-popping among friends! PLAY NOW: http://facebook.angrybirds.com/ It's a Flash based game, and it required at least Flash 11.
What is interesting is that it looks like they are not just doing the standard Angry Birds port - but adding some unique features for the Facebook version. On the Rovio blog they previewed some of the "Powerups" they are adding to the game: http://www.rovio.com/en/news/blog/129/sneak-peek-of-angry-birds-on-facebook/2012
That's true, but I really wished it is done in html5. My chrome wont upgrade to Flash 11 for some uncertain reason.