You can choose Facebook Widget in the Section Social tab:
Like Button: Let the user like and share your website.
You can set for the layout and button type by clicking Section -> Social -> selecting the first section and click Facebook Like Editor in the Widget box.
Facebook Comment: Let the user can like and comment about your website. It will show in their facebook. You can set for the appearance in Facebook Comment Editor.
Facebook Page: Link to your Facebook Page
You can adjust the appearance for your facebook page in Facebook Page Editor