There is a way to import all your contacts from Facebook account to Google+, all you need is a Yahoo email account actualy, funny isnt it? Yeah i know but this is the easy way to export from facebook and import the contact to Google+.
Alright, so im assuming you are already logged in into your Yahoo Mail account, now go to Contacts and import all your contact friendss from Facebook to Yahoo, when you’re done, save the contacts list as a CVS file and then go to your Google+ account and create a new group in which you will import all the contact from the CVS file saved from Yahoo Mail account. Once you finished all this steps you can enjoy all your Facebook friends on Google+ too. Have fun