If you linked a Facebook profile to your Trivia Crack account, and you don't see recently added friends, we recommend unlinking and relinking your account.
To do this, tap on your avatar, or profile photo, enter Profile and then select “Edit profile”. At the bottom of the screen, you will see the “Unlink” option. Then, follow the same steps and press the “Link with Facebook” button.
Once you do this, you will be able to find your contacts again when starting Classic games.