Apple has has introduced Tweet App as a built in app in iOS 5. In this lesson we will see how to turn off or change the alert sound for Tweet app.
Tap the setting icon on the Home screen then tap Sounds option under General Settings.
In the Sounds settings, tap the Tweet option and this would display the default Tweet sound set for Alert.
Now you can change the alert to any of the listed sound available under Alert Tones but it you want to turn off the Tweet alert then select None.