Top forums with most users online

Top Sites
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  1. Reddit 1.66 bill/mo (from 1.1 bill/mo in 7/16)
  2. Craigslist’s Forums 803 mill/mo (from 692.5 mill/mo)
  3. Quora.com 473 mill/mo (from 270.4 mill/mo) - up one spot
  4. Stack Overflow 315 mill/mo (from 280.8 mill/mo) - down a spot
  5. GamesSpot 219 mill/mo (from 128.8 mill/mo) - up one spot
  6. tianya.cn 199 mill/mo (from 59.5 mill/mo; this might not be that big in China though) - up 6 spots
  7. IGN Boards / 193 mill/mo (from 138.9 mill/mo) - down two spots
  8. 4chan 137 mill/mo (from 100.3 mil/mo) - down two spots
  9. Ultimate Guitar 107 mill/mo (from 60.6 mill/mo) - up 3 spots
  10. XDA-Developers Android Forums 102 mill/mo (from 74.3 mill/mo) - up 2 spots
  11. Slickdeals: The Best Deals, Coupons, Promo Codes & Discounts 82 mil/mo (from 56.1 mill/mo)
  12. KASKUS - Forum Diskusi Terbesar & Jual Beli Paling Murah 71 mill/mo (from 38.8 mill/mo) - up 4 spots
  13. 100% free sex stories, erotic audio, adult fiction with wifeslut, bdsm, etc! 52 mill (up from 31.8 mill/mo)
  14. Ars Technica 49 mill/mo (from 44.5 mill/mo)
  15. Bodybuilding.com 48.1 mill/mo (traffic stayed the same)
  16. macrumors.com 24 mill/mo (from 23.5 mill/mo)
  17. MoneySavingExpert.com 21.4 mill/mo
  18. StarCraft 2 Pro Gaming News 20.7 mill/mo
  19. NeoGAF 20.5 mill/mo
  20. 2ch.net 18.5 mill/mo (from 91.1 mill/mo) - traffic absolutely plummeted - down 10+ spots
  21. groups . yahoo .com 15.6 mill/mo
  22. Ubuntu Forums 15.1 mill/mo
  23. Whirlpool.net.au 13.9 mill/mo
  24. Cộng đồng phụ nữ lớn nhất Việt Nam 13.55 mill (from 76 mill/mo) - traffic absolutely plummeted - down 5 spots
  25. Showbiz, entertainment and media news 12.3 mill/mo
  26. Canadian Store Deals, Coupons and Sale Promotions - RedFlagDeals.com 10.3 mill/mo
  27. The Student Room 10.1 mill/mo
  28. Sherdog.com: UFC, Mixed Martial Arts (MMA) News, Results, Fighting 10.1 mill/mo
  29. Broadband ISP Reviews News Tools and Forums 9.5 mill/mo
  30. Flashback Forum | Yttrandefrihet på riktigt! 9.4 mill/mo
  31. 6park.com 9.2 mill/mo
  32. Something Awful: The Internet Makes You Stupid 8.7 mill/mo
  33. suomi24 .fi/ 7.6 mill/mo
  34. LinuxQuestions.org 7.5 mill/mo
  35. Gaia Online 7.4 mill/mo
  36. Nairaland Forum 6.3 mill/mo
  37. HealthBoards Message Boards 5.3 mill/mo
  38. FOK.nl cookie-informatie 5.3 mill/mo
  39. FlyerTalk - The world’s most popular frequent flyer community - FlyerTalk is a living, growing community where frequent travelers around the world come to exchange knowledge and experiences about everything miles and points related. 5.1 mill/mo
  40. College Admissions, Search, and Financial Aid Help from College Confidential 5 mill/mo
  41. Voat - have your say 4.9 mill/mo
  42. Aviation Photography, Discussion Forums & News 4.7 mill/mo
  43. democraticunderground .com/ 4.2 mill/mo
  44. mozillaZine 4 mill/mo
  45. nationstates .net/ 3 mill/mo
  46. Two Plus Two Poker & Gaming Strategy 2.3 mill/mo
  47. The PokéCommunity Forums 2 mill/mo
  48. Covering the World of Gran Turismo 1.9 mill/mo
  49. Professional Pilots Rumour Network 1.6 mill/mo
  50. Stormfront - White Nationalist Community 1.3 mill/mo
  51. Texas A&M Football, Recruiting, News & Forums 1.1 mill/mo
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What’s the source for this list?

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This list was based on Alexa traffic rank back in 2018 and it outdated now.
Feel free to recommend a new list :slight_smile: