You can easily link Zoho CRM with your social media account and able to zoho com login easily. Here are some of the steps that you have to follow to link your account with social media.
Click settings of your zoho account
login your social account as well
Click your social account like Facebook, email, etc
For more visit: https://www.nzaa.net.nz/forum/general-discussions/already-have-integrated-zoho-social-login-know-what-to-do