Without Google search.. I don't hardly know nuttin.
Amateurs 
The source is literally stated under the questions
I'm more worried about theymos' interpretation: it's probably a complext function that takes into account all kinds of seemingly unrelated data. And I'm pretty sure using smileys lowers your IQ 
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and starting next week, everyone with an IQ below 120 will be banned.
I am sad, ChartBuddy will be banned next week.I'm too afraid to try
Damn another smiley 