Missing News Feed in iOS 5

I am having a problem with Twitter application when opening in iOS 5: I can't find the news feed. I just got my new iPhone 4S then I backed up my old iPhone 4. Afterwards, I synched my iPhone 4s with my backed up files through iTunes. Then when I tried to open the Twitter app, it says 'Private account tap to retry.' I can see everyone whom I follow but I can't view the usual news feed. Can someone please help me figure this out?
