What are the reliable online investment?

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I have seen the website like line investments or even libertyreserve, well I just don't know if that one is online investment. But then what are the other websites that are reliable and can be trusted in terms of online investment like you are going to deposit your money then it will earn something? How reliable and secured it is? How did you know that is not scam? Does it worth to invest there? What are your thoughts regarding this matter?