[The total number of GWWC members on January 1, 2018, is] Between 3,500 and 5,000 (1.4x–2x growth)

Created by OpenPhilUnofficial on 2017-08-30; known on 2020-01-01; judged wrong by ccokeefe on 2018-01-01.

• OpenPhilUnofficial estimated 71% on 2017-08-30
• Pablo estimated 88% on 2017-08-30
• Pablo estimated 78% and said “The above is a typo.” on 2017-08-30
• peter_hurford estimated 60% on 2017-08-31
• themusicgod1 estimated 35% on 2017-08-31
• Michael Dickens estimated 67% on 2017-10-28
• ccokeefe estimated 5% and said “https://www.givingwhatwecan.org/about-us/our-members. 240 members in 12 days (=20/day) very unlikely.” on 2017-12-21
• ccokeefe estimated 1% on 2017-12-21
• ccokeefe said “3260. https://www.givingwhatwecan.org/about-us/our-members” on 2018-01-01
• ccokeefe   judged this prediction wrong on 2018-01-01.