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 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 you facebook page in Facebook Page Editor