Get Contacts from social networking sites
I would use Contact Importer in conjunction with OpenInviter.  It could be that you do not have an app for the specific social network to give permissions to allow access to users' data.

While I was configuring HybridAuth, there were options to allow your site to access contacts of users.  This requires you acquire an API key for each social network you want to access, which means creating an app.  If you're still having issues I could set up an app on the social networks you would like to access, then configure hybridauth and see if you can access the contacts through its API.