You can have some Google+ updates automatically appear on Facebook as status updates! To the best of my knowledge, this tip has never been published anywhere.
The simple idea is that you add a personal e-mail address as a contact on Google+, then set up that address to automatically forward the note to Facebook using the Facebook feature for posting via e-mail.
First, you'll need an e-mail address that is not the Gmail address you use for Google+ (Google won't deliver e-mail to the Gmail address associated with an account that is sent from that account.) You can create second e-mail account on Google, or use any other e-mail account. If you have POP3 or IMAP addresses connected to your Gmail account, those will work fine, too.
Now head over to your second e-mail account and set it up to forward e-mail coming from Google+ to Facebook.
If you choose the option to use a second Gmail account, here's how to set up the forwarding. Click on the gear-wheel icon in the extreme upper right, then choose "Mail settings." Click on the "Forwarding and POP/IMAP" tab, then on the "Add a forwarding address" button. Paste in your Facebook e-mail and click “Next.”
Now go get your confirmation code -- it's been posted to your Facebook Wall as a status update. Copy it, then delete the post. Back on Gmail, paste in the confirmation code.
Now that you've added your Facebook account as a forwarding e-mail address, it’s time to set up the forwarding. Click "Create a filter" to the right of the Search box. In the “From” box, add plus.google.com and in the “To” box, put the e-mail address you're using. Click "Next Step." Click the "Forward it to" box, and choose your Facebook e-mail address. Click "Create Filter."
Once you’ve set up an e-mail account to forward to Facebook, go to Google+ and click on the Circles button at the top. Click on the grey circle that will say “Create Circle” when you click on it. Click on the words "Create Circle." Add "Facebook" as the description. Click "Add a new person," and add your Gmail address, then click "Create circle with 1 person."
From now on, when you want to post on Facebook, simply add your "Facebook" circle to the addressing of the Google+ post. (Make sure you check the "Also email 1 person not yet using Google+" box.)
Note: Facebook will only post 44 characters of the message, so you'll have to be more concise even than you would be on Twitter.
Now all this setup may seem like a lot of work. Why not just log into Facebook once in a while?
I think it’s worth it. The reason is that streamlining your social networking into a single network saves you a huge amount of time.
Think about it: How much time have you spent wading through junk and spam on Facebook in the past year? It probably adds up to dozens of hours. By setting this up now, you'll cut your Facebook interaction down to minutes a month, and have more time to enjoy Google+.
Plus, it will encourage your family and friends to also leave Facebook, and join you on Google+.
Google+ is better, but Facebook has the advantage popularity. These three tips can let you have your cake and eat it, too. You can be on Google+ without disconnecting from family and friends on Facebook.