Ghost integrates with your social media accounts in several ways.

Connect your social accounts to your site
Enter  your Facebook and Twitter account details “General” settings of Ghost  Admin to enable site-wide links to your social profiles defined by your  theme.

Create custom sharing cards
In each  post you can create custom sharing cards for Facebook and Twitter in the  post settings menu. This enables fine-grained control of how your  content appears when shared by others.

Structured data integration
Ghost  includes full structured data and rich card support for Facebook,  Twitter, Instagram and many more — see the full list of integrations.