Twitter has updated its applications for two mobile operations systems, iOS and Android. The app adds a discover tab, which allows users to track activity related to your tweets such as retweets or favorites. It also updates the search functionality with added suggestions with different spellings. Notifications have also been updated so users receive immediate notifications pertaining to your tweets (retweets, favorites, etc).
The app can be found in the App Store on the iPhone and in Google Play for Android.
Source: Twitter Blog