public static Task LogoutFacebookAsync(this SocialAuthManager manager, IFacebookAccount account)
 {
     return(manager.LogoutAsync <IFacebookAccount, IFacebookAuthOptions>(ProviderType.Facebook, account));
 }
 public static Task LogoutGoogleAsync(this SocialAuthManager manager, IGoogleAccount account)
 {
     return(manager.LogoutAsync <IGoogleAccount, IGoogleAuthOptions>(ProviderType.Google, account));
 }