Facebook friend list import became easier after using latest Facebook SDK. Here is the method which imports friend list.

NSMutableArray *arrfriendList = [[NSMutableArray alloc]init];
[FBRequestConnection startForMyFriendsWithCompletionHandler:^(FBRequestConnection *connection, id result, NSError *error){
                          if (!error){
                              // These are the current permissions the user has
                              NSLog(@"Friends ===>> %@", result);
                             arrfriendList =[result valueForKey:@"data"];

                          } else {
                              // An error occurred, we need to handle the error
                              // Check out our error handling guide:
                              NSLog(@"%@",[NSString stringWithFormat:@"error %@", error.description]);
                          }
                      }];

For more help see the attached sample code.

Happy Coding ...!!!