One of the features I love about the Twitter application for iPad and iPhone is the use of the hash tag. I follow a particular hash tag during events like #debates, #ibm, #survivor, etc. The applications on the iPhone and iPad under the Discover area allow you to follow the activity for that particular hash tag and quickly use that hash tag in your own posts. When you click the write icon you get the hash tag placed in the entry field automatically for you and highlighted. This is a big time saver and removes error, especially for large search terms or hash tags. Check out the screen shots below where I follow the hash tag #ibm and then click the write button.