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The Power User Curve is a histogram of users’ engagement by the total number of days they were active in a month, from 1 day out of the month to all 30 (or 28, or 31) days. It shows if you have a hardcore, engaged segment that’s coming back every day. It also shows the variability among your users: some are slightly engaged, whereas others are power users. Power users drive some of the most successful companies — people who are highly engaged, and contribute a ton of value to the network.