Also, the more reputation you have the more you can give using the Little Green Thumb next to the Blog This Post Icon -
So for example, I just rep'd Obee, so he got all my 47 reputation points which will be added to his total rep points which in turn will help him get points to earn another green bar and gain more rep power for when he gives reputation to other players. Essentially, it's a point system for showing that a person has been deemed "helpful/constructive" by the community and in turn is shown by his/her amount of green bars. (The maximum amount of bars is 11 - 5 dark green/6 Light green.)
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