You can download the update directly on your iPhone, iPod Touch or iPad through the Apple App Store or by using the link which follows:
Twitter for iOS version 5.1 has the following new features and improvements:
See what’s popular within your network on Discover.
- Tweets, tailored just for you, now appear right in the stream
- These Tweets show photo, video, and article previews so you can engage easily
- A stream of relevant photos appears at the top of your search results
- Results also show media previews for your viewing pleasure
- If you've forgotten your password, now you can reset it in a few simple steps
- If you've chosen to protect your Tweets, you can manage your follow requests from your iPhone or iPad