There are many people using Google+ these days that already have Facebook accounts. It can be annoying and time consuming to post separately on both services. There's no need to do that though, you can cross post on both services and save yourself time and aggravation.
Here's how to post on Facebook and Google+ at the same time.
1. Find your secret email ID by logging into the Facebook Mobile page. You should see the email address at the bottom of the page after you login.
2. Go to your Google+ profile and write something you want to share.
3. Add your secret email address along with whatever circles you want to share the post with and then share.
4. Your post should now appear on Google+ and Facebook.