Chapter 9: Enclose in a NagivationController.
Chapter 9: Reconnect the compose tweet button.
Refresh control ends refreshing when the tweets are loaded.
Chapter 9: Prepare for segue.
Chapter 9: Introduce tweet id, and pass to new VC.
Chapter 9: Load tweet details and show them.
Chapter 9: Pull out coordinates and plot on the map.

None of the tweets I've looked at have a populated geo field...
Chapter 9: Show user details.

FIXME: The 'done' button isn't unwinding...