Share to Facebook in iMovie on iPhone
You can share your finished movie or trailer directly to Facebook if you have a Facebook account and are logged in to the Facebook app installed on your device. To set up a free account, visit www.facebook.com.
In the iMovie app on your iPhone, do one of the following:
From the Projects browser: Tap the movie or trailer you want to share.
If you’re editing a project: Tap Done (in the upper-left corner) to return to the project details screen, then tap the movie or trailer you want to share.
Tap the Share button , then tap Facebook.
Tap the options you want, then tap Post in the upper-right corner of the screen.