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I have seen cryptocurrency before but I took it for granted. There are some online currencies that are becoming popular these days but I'm not comfortable in investing real money into it as there is no real and tangible business that backs its value. The value increases just because of the demand of it and the value can easily go down when there is no more demand. This is just my understanding about online currencies. As for Cryptokitty, I will just go for a real kitty as I have enough of digital things in our world today.