iTrader is for when you buy/sell/swap something here on Spectra. You can leave feedback after the transaction is complete (identical to Ebay). As you receive feedback, your numbers increase. The green dot is "reputation" points. When someone thanks you for a post, or adds to your reputation (by clicking on the gray scales at the bottom), your green dots will grow

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Your friend is your needs answered.
Kahlil Gibran