Although Google+ is new in the Social Networking space and is miles behind Facebook, it has definitely started to make waves in the Social Networking space since its launch sometime back. Here's a way to update your Facebook status from Google+.
For this first you need to have your individual Facebook Mobile email address. You can get it from https://www.facebook.com/mobile/
Once you have your personal Facebook mobile email address, open your Google+ account and type in the status update. Now in the share with box, type the Facebook mobile email address and share the post. The status update will reflect on Facebook.