Developer InfectionFX has created a new hack using iPhone 4S Siri -- that once installed will let you tweet with Siri -- just open up Siri and say "Tweet".
"Coming soon from developer Tyler Nettleton aka InfectionFX is this Cydia Tweak, currently without a name, which will allow you to tweet with Siri. After installing through Cydia, you will be able to open up Siri and say "Tweet" (insert tweet here). Siri will say "Tweet Sent" then you can go ahead and check Twitter, if you want to, to see that it was in fact posted," explains the developer.
So far this tweak working well even in its pre-release state and is great for hand-free Twitter -- as shown in the video embedded below, as Siri remarks that the tweet was sent and the sound of a sweet little bird can be heard punctuating announcement.
The Siri tweak, which is not yet named will be available through Cydia app store by the end of the week.