I think the best approximation of worldwide Bitcoin users might be a factor of the number of forum users there are. Click on the members tab near the top of this page, and then click the column header twice, that says Date Registered. This will give you the name of the most recent 30 members of the forum. Hover over the top name, and you can see that he's number u=18915 (as I write this).
Maybe 5% of Bitcoin users register on the forum, so maybe there are 380K Bitcoin users.
Or another way to look at it: Look at sourceforge, search for Bitcoin, and see how many people downloaded the software. 79,385 this week. (you can also see how many over time, but that feature seems to be giving http500 errors at the moment.) 79K downloads in a very strong week. So maybe 400K downloads all-time.
So your number is probably in the right range. Definitely bigger than 100K, and probably less than 1M.
Topic: How many Bitcoin users are there? - page 2. (Read 21880 times)
Given a world wide internet population of 2,095,006,005 (March 31, 2011 - http://www.internetworldstats.com/stats.htm )
and a 1-month average Bitcoin (bitcoin.org) general internet reach compared to general internet usage world wide of 0.03130% (June 6, 2011 - http://www.alexa.com/siteinfo/bitcoin.org# - GRAPH - TRAFFIC STATS - REACH)
Will it be a reasonable approximation to estimate that Bitcoin (bitcoin.org) has a global internet reach population of roughly 2,095,006,005 x 0.03130% = 665,736 !! ?
and a 1-month average Bitcoin (bitcoin.org) general internet reach compared to general internet usage world wide of 0.03130% (June 6, 2011 - http://www.alexa.com/siteinfo/bitcoin.org# - GRAPH - TRAFFIC STATS - REACH)
Will it be a reasonable approximation to estimate that Bitcoin (bitcoin.org) has a global internet reach population of roughly 2,095,006,005 x 0.03130% = 665,736 !! ?
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