@IBAction func facebookLogin() {
        let loginManager = LoginManager()
        loginManager.logIn(readPermissions: [.publicProfile, .email], viewController: self, completion: { loginResult in
            switch loginResult {
            case .failed(let error):
                print(error)
            case .cancelled:
                print("User cancelled login.")
            case .success(_, _, _):
                SVProgressHUD.setDefaultMaskType(.black)
                SVProgressHUD.setOffsetFromCenter(UIOffsetMake(0, 44))
                SVProgressHUD.show(withStatus: "Loading... please wait!")
                let connection = GraphRequestConnection()
                let myProfileRequest = MyProfileRequest()
                connection.add(myProfileRequest) { response, result in
                    switch result {
                    case .success(let response):
                        print("Custom Graph Request Succeeded: \(response)")
                        UserDefaults.standard.set(response.name,
                                                  forKey: "DFUserProfileName")
                        UserDefaults.standard.set(response.email,
                                                  forKey: "DFUserProfileEmail")
                        UserDefaults.standard.set(URL(string: response.picture),
                                                  forKey: "DFUserProfileImageURL")

                        self.mobileLogin()
                    case .failed(let error):
                        print("Custom Graph Request Failed: \(error)")
                    }
                }
                connection.start()
                print("Logged in!")
            }})
    }