Which Interest Groups have the most traffic, here on Mylot??

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Im trying to figure it out, I know Mylot is big, the Children section, Computers and even some foods, like watermelon really holds its own compared to the two digits for some others. But how come there is duplicates of interest groups, like the Mylot interest group has 3 different icons you can choose from but not all have the same number under them, what does the number even mean?? Does anyone know what are the top interest groups here on Mylot, what do people LOVE to talk about here?