While the iPhone and Android apps remain relatively unchanged beyond gaining support for header images and the option to view user photo galleries, the iPad app has been completely redesigned. Gone are --they've been excised in favor of a unified mobile look.

In portrait orientation, the iPad app now looks similar to its iPhone cousin. In landscape, the timeline is centered, with the four Twitter buttons--Home, Connect, Discover, and Me--along the left side. Tap a tweet, and it enlarges into the Tweet Card format that the website currently uses.

To set a header image within one of Twitter's apps, tap on the "Me" icon in the menu bar. You should see your profile picture with a black background. Tap the settings cog below your profile, then select "Edit profile."

On the next screen, select "Header" to select an image to use; you can either take a new photo or choose an existing one. Once you've got your image, save your selection and you're done. Within a few seconds, the new header photo should show up on all your devices and on Twitter.com.