Login with social networks

Hello all, I am using WP multisite on my website. I am facing problems like fake email registration. And my cpanel account suspended due to a lot of spam emails in one hour. When I check inbox after reactivate of my cpanel. I noticed that there were lots of failed emails sent to emails which is not exist in the world.
I discuss with my hosting provider. They told me to do something that only the user will register with social networks. If they have valid social profiles they can register on my website. And there would be no other way to register on my website. So, please anyone can help me to achieve this target of registration on my website.

Thanks in advance.