How does myLot score you...?

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I have this question in my mind since i start working in here...How does myLot score your discussions and posts? People said that quality and length of the discussions and posts effect how much you get pay. I can understand that they could set the system to pay you more when you type longer post, but how do they score you base on quality..? Do they have people browsing the site and determine the quality of people's posts..?