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Where can I invite my friends to this website and get some rewards ?
Go to the "message" page, down the left hand side is a link "as a godmother I get gifts". That link will take you to the page to send invitations:
(http://us.ohmydollz.com/?p=contactgrabber )
I invited my friend and I did not get any rewards. Why ?
I think she had to validate her account for you to get the reward?
Also if your friend registered while using YOUR computer, that shows up with the same IP address so you won't get a gift for that reason.