Do you work on any photo sharing sites which pay money for uploading?

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There are many sites boasting of paying money for sharing photo's.I have gone through many of them, but haven't joined any site till now.They say they pay us money for every unique photo we send and some sites even charge money for registering into their site.Do any one of you have any experience on such sites? have you earned anything by working on such sites? are there any legit sites around which are worth trying out without any joining fee? share your views here