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The data is based on my experiments on different channels regarding direct selling and the interaction/engagement that I get - it's all average data, since I didn't break it in different channels. You can try it yourself by tracking all the visits, clicks, likes, shares etc. per each day of the week.

FYI - i checked through the stats posted by @penguinpablo... it seems steemit is most active in commenting and voting Wed-Fri...