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An app could probably be made to track power downs and rate them in size.

I've been a regular follower of @penguinpablo's "steem stats" and saw these large transfers to the exchanges take place just before this big crypto crash. And thought to myself "do they know something I don't? maybe I should be selling too."

Makes my foil hat buzz.

If you are at all interested in regular steem stat updates I recommend following him. Good information, depressing lately but well presented none the less.