Free offer online

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I always receive some emails about free gift offer such as laptop, GPS, HDTV... If you want to get these gifts, you need fill out some suveys and sometimes you need complete other two business partner offers, for example pay a little money for shipping fee to some gifts, buy a magazine and so on. You need provide your credit card number. I do not know whether it is a scam or not, did someone participate this kind of offer? Thanks.