Twitter is now fully integrated into new Apple’s iOS 5 mobile operating system.
Now you can easily share and read tweets on your iPhone, iPod, and iPad.
Just enter your Twitter login information into device settings and you will always stay connected to your twitter account directly from iPhone apps like camera, safari, Youtube, maps, and also from third party apps.
Twitter has also launched new iPhone Twitter App which allows you to upload images directly to (pic.twitter.com) Twitter.
Download the updated iPhone Twitter App from here.