You can add social media links and enable/disable social media in both the Header and Footer Section from the customizer.
- Go to Appearance > Customize > Social Media
- Now you can add the link to your pages in the respective fields.
In this section, you will also get a list select which social media you want to display to share your blog post. You can check and uncheck from the list. You can add your twitter id so that your Twitter page is tagged directly while sharing the post.