It's kind of virtual money that coincidentally uses the dollar sign. With the money you can buy stars next to you name for a day or something like that, you can go to the "bank" part and you will see a "shop home" with the things you can do with the money ^-^
By replying to the threads, you need to write at least 50 characters and general chat and the community games makes you earn 5$ per reply, novel threads gives you 25$. You can also transfer the money to other people and other people to you ^-^
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