[Shaun]

I'll include overall and "by section" (within reason. I won't find the most-viewed thread about Alexandra DeGale )

Overall
1) MTV's Jusy and the Happy Turtles [Axed after 6 seasons!] - 1,072,348 views
2) Big Brother US 16 - Pics - Exposed / Oops / Nude etc. - 638,807 views
3) Andyman's Brotherhood - 516,077 views
4) The Hot Girl thread! - 381,228 views
5) The Hot Guy Thread - 337,646 views
6) Talk Football Here - Part 1 - 269,655 views
7) Eastenders discussion - 211,938 views
8) The GIP Picture Thread (for the Sexy Female Housemates) - 208,177 views
9) Traci Bingham's Swollen Clitoris - 205,354 views
10) The Official Lady Gaga Appreciaton Thread-Live coverage of MB show! = 189,183 views
Special mention: Mr. Lemon, why the bandage? - 172,194 views (Also the only thread to have this many views with just 1 page)

Celebrity Big Brother Summer 2017 [CBB 20]: Celebrity Big Brother 20 Live Launch CH5 9pm 1/8/17 - 13,763 views
Big Brother 18 (Summer 2017): The Finalist Raph Korine Fanclub [130 Members] - 81,799 views
Celebrity Big Brother January 2017 [CBB 19]: Celebrity Big Brother Live Finale Discussion - COLEEN WINS - JEDWARD RUNNERS UP! - 12,231 views
Big Brother Designs (fan made): Big Brother DVD Designs - 40,205 views

Big Brother: BB1-BB17: BBUK Re-Watch/First Watch Thread (Part 1) - 129,419 views
Big Brother 1: What did Nasty Nick accually do? - 11,556 views
Big Brother 2: Who would like to do a charity stroll with Josh? - 41,385 views
Big Brother 3: Rewatch and discuss series 3 here in the run up to series 12!!! - 27,264 views
Big Brother 4: Sun Offers £50k for Big Brother Sex - 18,375 views
Big Brother 5: ART PHOTOS!? Michelle topless! - 53,117 views
Big Brother 6: Was Sam bullied by her fellow Housemates? - 13,798 views
Big Brother 7: Imogen Thomas 'crushed to death' in new BBC drama - 87,871 views
Big Brother 8: Emily Parr in nude photo shoot! - 124,637 views
Big Brother 9: BB9 live feed topic - 74,500 views
Big Brother 10: Noirin Kelly is the latest Big Brother contestant to strip [Now inc. Topless pic] - 139,504 views
Big Brother 11: Big Brother 11 - Live Feed Discussion (part 1) - 168,726 views
Big Brother 12: The GIP Picture Thread (for the Sexy Female Housemates) - 208,177 views
Big Brother 13: Big Brother live updates [Twitter] - 25,380 views
Big Brother 14: ツ - Official Dexter Koh Fan Club - 2ND PLACE - ツ - 43,976 views
Big Brother 15: BB15 - BOTS discussion thread - 48,733 views
Big Brother 16: *** The Big Brother 16 ratings thread*** - 49,524 views
Big Brother 17: Big Brother UK 17 - General discussion thread - 83,781 views
Big Brother: Celebrity Hi-Jack: TiBB Big Brother Celebrity Hijack Housemate Banner making challenge - 14,107 views
Ultimate Big Brother: Live Feed - Finished. - 51,958 views

Celebrity BB 1 - 5: Shilpa Shetty Fan Club!!! Biggest fan club !! 92 MEMBERS! - 47,828 views
Celebrity Big Brother 6 (2009): CBB live feed topic - 23,589 views
Celebrity Big Brother 7 (2010): Celebrity Big Brother Live Discussion - 61,199 views
Celebrity Big Brother 8: CBB's Bit On The Side - Discussion Thread (Every Night on Ch5 & 5*) - 32,088 views
Celebrity Big Brother 9: Karissa & Kristina Shannon Fanclub - The Biggest Fan Club for The Greatest Housemates - 26,128 views
Celebrity Big Brother 10: Ashley McKenzie's Morning Erection Tribute Post - 33,823 views
Celebrity Big Brother 11: ***The Official CBB11 Ratings Thread*** - 17,994 views
Celebrity Big Brother 12: Celebrity Big Brother 12 Live Feed Thread (12-2AM Nightly) - 15,492 views
Celebrity Big Brother 13: Channel 5 Celebrity Big Brother YouTube Videos Feed - 25,688 views
Celebrity Big Brother 14: Celebrity Big Brother 14 Ratings Thread - 15,277 views
Celebrity Big Brother 15: Celebrity Big Brother 15 Ratings Thread - 24,824 views
Celebrity Big Brother 16: James and Austin appreciation thread #Jaustin - 37,862 views
Celebrity Big Brother 17: Tiffany "New York" Pollard Fanclub! ~Thank You Lord~ [100+ Members!!!] - 27,723 views
Celebrity Big Brother 18: CBB18 Launch Night Discussion Thread - At 9.00 PM tonight - 16,845 views

Big Brother in general and international BB: Big Brother Norway-Sweden 2006...some clips - 86,396 views
Big Brother USA (inc. BBUSA seasons 1-17): Big Brother US 16 - Pics - Exposed / Oops / Nude etc. - 638,807 views
Big Brother Australia: Big Brother Australia 2008 [That is all.] - 42,011 views
Big Brother Canada: Big Brother Canada 4 - Live Feed Discussion Thread (Part 1) - 64,607 views

General Chat: Andyman's Brotherhood - 516,077 views
Celebrity News: Katie Price updates [Katie Price having 'difficult pregnancy'] - 78,634 views
Health, Beauty and Fashion: Celebrities that have aged gracefully - 9,063 views
Serious Debates and News: The EU - Referendum - 23rd of June 2016 - in or out? - 45,983 views
Private Chat Threads: Castle Black (Lounge 17) - 34,200 views
Chat and Games: MTV's Jusy and the Happy Turtles [Axed after 6 seasons!] - 1,072,348 views
Music: The Official Lady Gaga Appreciaton Thread-Live coverage of MB show! = 189,183 views
Tech, Movies and Video Games: What was the last film you watched? - 105,889 views
Sport: Formula 1 - Archive Thread - 57,130 views
Football Forum: Talk Football Here - Part 1 - 269,655 views
Wrestling: All Things Wrestling I - The Archives - 147,452 views
Creative Writing and Books: Currently reading - 32,735 views
General Interests: Lets see your desktop! - 35,538 views
Graphics: The Official Show Off Your Graphics Thread - 159,547 views

TV Chat: Game of Thrones thread - 76,845 views
Soaps: Eastenders discussion - 211,938 views
Other Reality TV: RuPaul's Drag Race thread - 104,412 views
Dancing on Ice: Dancing on Ice 2009 Line Up - 58,766 views (Only 2 pages, too)
All X Factor forums: X Factor contestants Twitter posts (including replies) - 46,140 views (Whatever happened to Twitter Robot, James?)
There's no IAC thread with more than 17k views so I'm not going to bother
Britain's Got Talent: Stephen Mulhern is NOT gay - 27,682 views (The only two other threads with 20k+ views are also 2-page (max) wonders about contestants being gay )
No SCD thread with more than 14k views so I'm not going to bother
The Apprentice: Luisa "raunchy" photos leaked - 36,108 views

Announcements: Forum Rules - 32,768 views
Suggestions/Help + New additions: Username Changes - 53,196 views
Interactive Archive: Elimination 3: Live Topic [#1. Old.] - 115,472 views

I'm sure there're probably many more that have been deleted or something but hey ho.