The popular iPhone app Angry Birds has been launched on Facebook in a liberal version that could be played on internet browsers.

The game, which has been downloaded 500 million times – and evening said to get David Cameron as a fan – involves flinging cartoon birds at pigs.

On Facebook, users may maneuver the game using a mouse to fling birds across the screen – kinda than a finger as they would on the iPhone’s touch screen.

Even ahead the launch, the game had 15 million “Likes” on the social networking site, the Everyday Mail reported.

The Facebook version will let users to earnings for more birds and other in-game extras, equally well equally sharing scores with others via News Feed.

Peter Vesterbacka, head marketing officer of Finnish parent company Rovio, enounced it was hoped that 40% of Facebook users would pay for add-ons.