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f I am not wrong then Seesmic is the first BlackBerry Twitter Client to add support for Ringtones depending on your account and what kind of message you receive on twitter.
For example on BlackBerry there is already a common tone used when messenger services like yahoo or blackberry messenger gets a new message.
Awesome now I know if I got a direct message or got mentioned and open it right there instead of getting disappointed that the message was from Yahoo Messenger.
Apart from this improvements are also made for User Interface and XAuth for more security.
You can find more details on their official blog post.
