Comparing our stats to worldwide stats might help us target our 'publicity'.
As an aside, this link has our current statistics. Although we are still in infancy (250 visits/day and we need 2,000 to launch), so take this with a grain of salt, it shows about 70% of visits are from the US (assuming I'm reading it correctly). Stackexchange overall is about 1/3 US and this is probably more representative of where we will end up.
I could not find data explicitly on genealogy worldwide and I confess I'm US-centric so my experience has mostly been with US-centric genealogists. I did find myheritage's membership map. It is a non-us-based company with 64 million members. I couldn't find the by-country split but the US is large enough they treat each state like a country. Judging the height of the bars, I'd guess myheritage's 64M members have similar stats to the se stats ie that US is largest but not a majority.
I couldn't find the by-country stats for the Association of Professional Geneaologists but that would be useful to have since we are targeting experts during the beta.
How many genealogists are there and where are they worldwide by country?