If you go www.ford.ca and click on "Vehicles" at the top, the "Build Bronco" button shown in the tweet is in the middle. Clicking it nets no results. I also tried to edit the links in their builds to what I thought the bronco link should be. Still no results.
Ive discovered that any vehicle you click on, then click on the "vehicles" tab at the top it changes the "Build and Price" option to the previous vehicle you clicked. Mine was showing "Edge" until I went to "future vehicles" and clicked on Bronco. Now the Design/Build button in the middle is once again showing Bronco.