If you are a business owner, cut all of your employees salary by 5 % and promise a 5 % raise to all employees that have a Google Plus account. Be harsh to them, don`t give them invites.
If you are a religious figure, proclaim that Facebook it`s evil and if they want redemption, they will need a Google Plus account and they will need to add you in a circle. They will have to prey to get a invite.
If you are the president of a country of two, change the law so that without a google plus account you cannot leave the country. Then bankrupt the country so that people will start trying to move to other country’s .Change the law again : “The only legitimate way to get a Google Plus invite it`s by paying a fee to the president for a invitation.”
If you do not have some kind of "super power",try this :
If you live with your parents, threat them that you will leave home if they will not get a Google Plus account.
If step 1 fails, go to step 2 : At least ask them to delete their Facebook profile.
Step 3 : Leave home and hate Facebook.