Angry Birds, the iPhone and iPad app puzzle game featuring wingless birds developed by Rovio Mobile, is the number one paid-for app brought from Apple's App Store and iTunes in 2011.

two Angry Birds spin-offs, including Angry Birds Seasons and Angry Birds Rio, are also in the top 10 among the bestselling paid-for apps for iPhones in 2011. Angry Birds was the first game released for Apple's iOS system in December 2009, and since then it has sold millions of versions. Players of the game use a slingshot to launch the round, red, wingless birds at pigs on or within different structures with the aim of destroying all on the playing field.

Angry Birds is popular because of its addictive format, humorous concept and low price.

Facebook was the top free app for the iPhone in Apple's store thus far in 2011 for the iPhonits e, and Twitter, Skype and Groupon were also among the Top Free iPhone Apps.

Below are the most popular apps as chose by consumer demand at Apple's iTunes and App Store in 2011:

Top Paid iPhone Apps

1. Angry Birds
2. Fruit Ninja
3. Angry Birds Seasons
4. Cut the Rope
5. Tiny Wings
6. Angry Birds Rio
7. Words With Friends
8. Camera+
9. Doodle Jump
10. Plants vs. Zombies

Top Free iPhone Apps

1. Facebook
2. Pandora Radio
3. Words with Friends Free
4. Angry Birds Free
5. Skype
6. Netflix
7. Angry Birds Rio Free
8. Groupon
9. Fruit Ninja Lite
10. Twitter

Top Paid iPad Apps

1. Angry Birds HD
2. Pages
3. Angry Birds Seasons
4. GarageBand
5. Angry Birds Rio HD
6. Penultimate
7. Fruit Ninja HD
8. Cut the Rope HD
9. SCRABBLE for iPad
10. Keynote

Top Free iPad Apps

1. Angry Birds HD Free
2. The Weather Channel for iPad
3. Netflix
4. CNN App for iPad
5. Angry Birds Rio HD Free
6. Kindle
7. Skype for iPad
8. Calculator for iPad Free
9. Pandora Radio
10. Calculator Pro for iPad Free