I'm getting a message that says “Your Facebook ID could not be found. Make sure your profile is not hidden on Facebook and that you are a fan of DriveSafe.ly.” / I’m getting a message that says "Your friends were not visible. DriveSafe.ly could not verify your fans. Please visit www.drivesafe.ly/fan for more information"
This is because your Facebook ID is not publicly visible and/or searchable. Log on to Facebook -> Settings -> Privacy -> and make sure your “Profile” and “Friends List” is/or publicly visible. Then go to Facebook -> Settings -> Search -> Make sure “Search Visibility” is set to “Everyone” and all the checkboxes are checked.