Updated Twitter Android and iOS Apps are now available for download.
Twitter app for Android:
The new Tweet composer to share with quick access to your camera roll and clear previews of how your Tweets will appear.
Richer notifications now include details like avatars and indicate how people are interacting with you (reply, retweet, etc.) for devices running Android 4.0 and higher,
wider and taller timelines in all parts of the app including profiles, search, and Discover.
Receive a notification when a friend has joined Twitter.
Download Twitter for android from google play store
Twitter app for iOS:
New Tweet composer for iPhone makes sharing photos easy and lets you preview how your Tweets will look.
Wider timelines in all parts of the app
Receive a notification when a friend has joined Twitter
Improvements and bug fixes for lists