The following are the numbers of people who have already joined.
United States (16,310,256 people)
Canada (1,689,034 people)
United Kingdom (2,744,316 people)
Australia (953,934 people)
France (2,186,220 people)
Germany (1,656,221 people)
Taiwan (277,062 people)
Philippines (419,593 people)
Singapore (227,796 people)
Hong Kong (177,002 people)
Thailand (130,643 people)
South Korea (26,790 people)
India (2,674,643 people)
Malaysia (282,686 people)
Japan (178,090 people)
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After entering the site, clicking "Browse" above, you can see the latest number of people in countries have joined.