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Twitter index: 'Bad Piggies' launched, Avril Lavigne's birthday

Twitter users are wishing pop singer Avril Lavigne a happy birthday and celebrating the launch of the smartphone app Bad Piggies on Thursday, September 27.

Bad Piggies is the latest creation from Rovio, the maker of the hit smartphone app Angry Birds. Bad Piggies, which hit stores today, challenges players to "build the ultimate flying machine" and guide the pigs to the location of the Angry Birds' eggs. The app costs $0.99 and can be downloaded from the iTunes App Store and via Google Play.

Fans of Canadian pop star Avril Lavigne are taking to the microblog to wish the recently engaged singer a happy birthday. Lavigne, who turned 28 today, is expected to release the first single from her as-of-yet untitled fifth studio album in October.

The top 10 most talked about topics on Twitter on September 27 at 1:00 pm GMT are:

01. #lepersonechevorreiabbracciare
02. #FavoriteLinesInClass
03. #BGAP
04. Herbert Lom
05. Sol Yanimsin Besiktas
06. Happy Birthday Avril Lavigne
07. Ada Cinta
08. Dia Mundial del Turismo
09. Feliz Jueves
10. Bad Piggies