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Great question! I don't know of any off the top of my head, but the user @me-tarzan does frequently post on some statistic data that he gathers himself.

I think the current statistics show around 8,000-10,000 active user accounts per day and around 50,000 unique visitors to the website.

If I find any more info/tools, I'll let you know.

Here is a site that shows statistics on the number of active users
https://steemd.com/distribution
(note, it is a little slow to load.)

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