what is CashGopher ??

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what is Cash Gopher ???? i have seen this link in my email send by mylot everytime. i just visited this site and it tells us to download some kind of software which works during our idle time on computer. and they give money for it and sharing their advertising revenue. Does any one know how exactly does it work and why we get paid ??? is there any pros and cons about it ?? has any one installed it before ? please enlighten me !!