code: def extra(request, provider):
      
      identity = request.session.get('identity', None)
      if not identity:
          raise Http404
  
      if request.method == "POST":
          form = str_to_class(settings.EXTRA_FORM)(request.POST)
          if form.is_valid():
              user = form.save(request, identity, provider)
              del request.session['identity']
              if not settings.ACTIVATION_REQUIRED:
                  user = auth.authenticate(identity=identity, provider=provider)
                  if user:
                      auth.login(request, user)
                      return redirect(request.session.pop('next_url', settings.LOGIN_REDIRECT_URL))
              else:
                  messages.warning(request, lang.ACTIVATION_REQUIRED_TEXT)
                  return redirect(settings.ACTIVATION_REDIRECT_URL)
      else:
          initial = request.session['extra']
          form = str_to_class(settings.EXTRA_FORM)(initial=initial)
  
      return render_to_response('netauth/extra.html', {'form': form }, context_instance=RequestContext(request))
docs: Handle registration of new user with extra data for profile