Facebook has restricted the way apps can access a user's contacts. Therefore, the contacts from both must be first synced to your device. Once they are in your phone's contact list, CircleBack would be able to get those contacts from your device the next time you launch the app. These connections won't reflect as 'Networks' under your CircleBack app as the steps provided are the work-around to connect these sources.
Please see our blog post here about how to take advantage of your Facebook contacts within CircleBack: