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Every time someone shares one of your posts or clicks on the hubwheel next to your comment, it contributes to filling out your hubwheel at the top of the screen. Each time it's filled, you get a badge that you can give away. I don't believe that you can give away badges that other people have given you. Though, I have not received any badges myself, so I may be mistaken. thenewgreen or insomniasexx could probably answer that question.