Siri may be the most exciting feature of Apple's new iPhone 4S but there's one thing it won't do, tweet. Well officially it won't tweet for you but you can trick it if you have a Twitter account synchronized with your phone number for SMS updates. 

Siri can send text messages to people just by listening to you so it is possible to tweet, you just have it send a text message to Twitter's short code. 

1.  Qualifications: A Twitter account associated with your mobile phone number, an iPhone 4S and internet connection.

2.  Activate Siri on the iPhone 4S by holding down the Home button. Say "text [your message]."
For example, here I said: "Text this tweet was sent from Siri period."

3.  Siri will now ask you who to send the message to. Say the Twitter short code for your country/carrier. In the U.S. it is 40404. Say "40404."

4.  After address Siri to send the message to Twitter she'll ask your to confirm. You can tap the buttons on the screen or say "send" or "cancel." You may even say "edit" if you want to edit the message. 

This may not be the fastest method for sending regular text messages through Siri, but I believe it is the only way to send SMS updates to Twitter. You may find yourself attempting to say "text Twitter this tweet was send from Siri period" but you'll receive a message that Siri cannot help with Twitter. In addition, when Siri asks to whom to send the message if you say Twitter, even if it is in your contacts, it'll just keep asking. 

After all, Twitter is integrated into iOS 5, here's to hoping Apple adds the functionality to officially tweet from Siri.