The steps below are no longer needed, just add this Repo: http://weeplugins.com. Search for WeeTwitter and install it.
If you don’t know how to SSH into your iDevice see this post for assistance.
1. Login to WinSCP or Cyber Duck.
2. Navigate to /private/var/root/Media/Cydia/AutoInstall
3. Drag and drop the WeeTwitter deb file into that folder and click “Copy”.
4. Reboot your iDevice, after it is booted up “repring” it.
5. Login to twitter on your iDevice via the website twitter.com.
6. That’s it you should now be able to use WeeTwitter Enjoy.