Recently Facebook changed privacy approach so apps can not access your complete friendslist.
Roster Buster can access friends who have previously connected to our app. If a you have a Facebook friend who signed up for to Roster Buster but never connected via Facebook, you will not be able to see them. When try to add friends via Facebook the list shows no result.
Please also check the Roster Buster app settings in Facebook with the following steps.
- Go to Facebook.com and login
- Go to Settings
- Go to Apps you will see below screen
The select the Roster Buster App and make sure we can access your friends list. Check Friendlist item.