Why repeating left frame?

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Whlie we myloting you may able to watch that the left frame showing currently active discussions. But, it rotate with few topics only I think. Because, this site shows thousands entries adn I myself ticked about six hundred interest. but still it surrounding with mylot, makemoney, internet and so. Though, I'm able to select my choice from the bottom of the page. It makes me think that we are around some few topics only. Are we?