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You can connect your social network to your app. To do so, you can add a Facebook section to your app. 
  The Facebook section works as described below depending on the platforms included in your offer:  
PWA: it will open your Facebook page's Url under a new browser tab  
Android Native version: It will open a web view of your Facebook page's Url  
iOS Native version: It will open a component of Safari mobile with a web view of your Facebook page's Url

Add and set a Facebook page
1. In the left swipe menu go to Design & Structure  > Structure > Sections     
  2. Click the green button "Add a section" from the right column   
  3.  Add a Facebook section by choosing "Facebook" in the content items.     
  4. Give it a title  
  5. Fill in your Facebook URL
  6. Click "Add" 

Create a link to your Facebook account
You can also add a link to your Facebook account in your navigation mode header, footer, or in the logo & title of your app if you think it is better for your app users.

Design