There are 2 repositories under magento2-social topic.
Magento 2 Social Follow Buttons extension allows you to increase the number of followers in each of your social media profiles.
Magento 2 Social Login extension allows your buyers to log in or create an account at your store with their social media accounts.
Magento 2 Social Share extension allows you to auto-post any user’s appreciation on 220+ social networks, and increase traffic on your site.