What is the name of a person who is given money by some brands for advertising their product in public sites?

I heard a name for people who are paid for speaking good or advertising a brand's products in public sites...I forgot it.Just like to know teh name...
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Hello friend, Is it http://www.okgate.net ? I know it just do it, maybe you can visite it first and confirm it. I do business with this company and this is its website. I think it is good for me. You could have a try.
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sponsers?