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I'm trying to find the post talking about times but haven't yet. It boiled down to "correlation does not equal causation" but the author's findings showed 6 PM CST was having the best luck.

As for topics, here's a good post: https://steemit.com/steemit/@steemrollin/categories-that-make-you-money-on-steemit

Thank you very much @imjefe!