There are a few survey websites that allow you to take surveys, earn points and then with those points buy superstar membership (or other rewards). I've tried them out before although it seems that you will need to spend hours and hours to be able to buy SS membership. This is the first time I have seen stardoll advertise something like this on their site. I'm not sure how long it will take with this offer to earn some extra stardollars. You can not earn membership with this offer, only stardollars. Have you used this yet? What do you think?

Update: The link is here: http://www.stardoll.com/account/cint.php

Update2: Looks like this offer is only available for some countries. Sorry, I should have checked before posting.