How to earn with sitetalk.com

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Iam using every opportunity to earn in euros on net. I came across sitetalk.com, and i know they pay in euros . but the thing is in what category this site belongs to? whether is is GPT site, or social networking site? They told that they pay for the no of referrals that we have. Do they really pay for simply the no of referals we have? What do u thing about this site?