With the help of other B2uties from Onehallyu - Izza (mizuki/doolicious), Leon, & one2gk, I have compiled this list. I hope this helps!
BEAST
> Playb2st (BEAST's Official Daum Fancafe)
> BEAST Japan Official Website
> Twitter: @BEAST_japan_
> Blog: BEAST Official Blog
> B2stium (BEAST's Fan Community Site)
> Twitter: @b2stium
> B-dong (BEAST's Fan Community Site)
> Twitter: @bdongcom
> mizone
> Twitter: @MIZONE_BEAST
> Twitter: @MIZONE_JP
> Twitter: @MIZONE_SG
> it's sprintime
> Twitter: @it's_springtime
> midnight
> Twitter: @1016midnight
> trippin
> Twitter: @trippin_beast
> GRIN,B
> Twitter: @grin_b2st
> moderntimes
> Twitter: @Modern1016
> Mellow
> Twitter: @Mellow1016
> Adrenaline (coming soon! 12/25 OPEN)
> Twitter: @Adrenaline_1016
> Beastar
> Twitter: @BEASTAR1016
> betweet
> Twitter: @beastwith6
> History
> Twitter: @HISTORY1016
> First Love
> Twitter: @firstlove_1016
> Sinabeuro
> Twitter: @Sinabeuro1016
> my DREAM boys BEAST
> Twitter: @dreamboys1016
> Night and day
> Twitter: @Nightandday1016
> leader_878992 (multi-fandom)
> Twitter: @leader_878992
----- Personal Accounts > updates either on twitter or youtube
> beastnuna
> AtlantisBEAST
> WITHB2STFORB2ST
----- Twitter Accounts/Fansites for International Fans that update about BEAST
> B2STRising (1st International Forum for BEAST)
> Twitter: @B2STRISING
> Hyunseunghips
> BEAST are the BEST (French)
> Twitter: @BEASTaretheBEST
> B2UTYMAKASSAR (Indonesia)
> Malaysian B2UTY (Malaysia)
> Twitter: @MYB2UTY
> BEASTPH (Philippines)
> Twitter: @BEASTPH
> B2STURKEY (Turkey)
> Twitter: @B2STURKEY
> Beast Italian Dreams (Italy)
> Twitter: @B2ST_Italy
> B2STera
> Twitter: @B2STERA
> B2STrend
> BEASTSTORY
> B2STLYTWEETS (mostly inactive)
> B2ST Charts
> BeautifulSubs (occasionally active)
> Twitter: @beautifulsubs
> B2STIZEN (subbing & translations - occasionally active)
> Twitter: @B2STIZEN
> yuri minji (occasionally active - subbed Burning the BEAST from episode 3 onwards)
*B2stlysubs is no longer active or is in indefinite hiatus which is why it's not included.
----- International Kpop Forum Communities - BEAST Threads
> Onehallyu - most active at the moment (BEAST / Doojoon / Hyunseung / Junhyung / Yoseob / Kikwang / Dongwoon / Troublemaker)
> EntAsia (previously Kayoforum)
> Kpopselca
> Soompi (Part 1 / Part 2)
Individual member fansites
Doojoon (Yooniques)
> AllDay DJ
> Twitter: @allday_dj
> Durebak
> Twitter: @durebak0704
> DU FOR YOU
> Twitter: @DUFORYOU_DJ
> The Dazzling July
> Twitter: @theDJ74
> DUSPOON
> Twitter: @DUSPOON
> ComeOn DJ
> Twitter: @COMEON_DJ
> Kidult
> Twitter: @Kidult_dj
> BEYONDU
> Twitter: @DJ_ssuma
> LOVE U LIKE U
> Twitter: @LOVEULIKEU_DJ
> Du it chu
> Twitter: @DUitchu_dj
> DUremi
> Twitter: @DUremi_DUJUN
> Lovey Boy DJ
> Twitter: @loveyboy_dj
> One&OnlyDu
> Twitter: @OneNOnlyDu
> DuDream
----- Personal Twitter Accounts > updates either on twitter or youtube
> @Duegrady_DJ
> @bambi890704
> @dujunhouse
> @DuVariety
> @yk10v2
> @FlyWithDujun
Hyunseung (Honeys)
> Cherish JHS (Hyunseung's 1st Fancafe)
> Twitter: @starhyunseung
> Oh, My Ran!
> Twitter: @ohmyran93
> Soul_Peace
> Twitter: @SoulPeace_CN
> JUST U
> Twitter: @JUST_JHS
> Hi Baby JS
> Twitter: @hibaby_js
> Lunatic JS
> Twitter: @LunaticJS
> JS KINGDOM
> Twitter: @Kingdom_JS
> JStar
> Twitter: @JStar_JS
> Dramatic Style
> Twitter: @DS_JS_93
> 903%
> Twitter: @903_PER
> ATTENTION! JS
> Twitter: @Attention_921
----- Personal Twitter Accounts > updates either on twitter or youtube
> @zizicafe
> @Dazzling_J
> @shinpi Ran
> @_BlingblingJS
Junhyung (Jesters)
> Freeze
> Twitter: @freezejh
> Shine Of You
> Twitter: @ShineOfYou
> The Joker
> Twitter: @TheJOKER_Eun
> HEY,JOKER
> Twitter: @HeyJoker_1219
> TRENDIEST
> Twitter: @891219com
> YONGTIME
> Twitter: @yongtime1219
> JOKER'S WILD
> Twitter: @JOKERsWILD_JH
> Joker's
> Twitter: @Joker_S_1219
> MACAROON
> Twitter: @Macaroon_JH
> Joker Ppang
> Twitter: @joker_ppang
> You Are My Special
> Twitter: @Miminuna_891219
> Perfume
> Twitter: @MintManJH
> Yong-gung
> Twitter: @yjhpalace
----- Personal Twitter Accounts > updates either on twitter or youtube
> @Joker_Spotlight
> @mrjoker1219
> @beatoms
> @17komu17(uploads fancams on her YT channel)
Yoseob (Yeobos)
> SOULMATE (Yoseob's Official Fancafe)
> Twitter: @soulmate_yys
> My Chu
> Twitter: @My_Chuu
> Heal the Pain
> Twitter: @_idolholic
> YGBD
> Twitter: @ygbd0105
> Inner Peace
> Twitter: @innerpeace_ys
> Pure Yogurt
> Twitter: @Pure_Yogurt
> I Look At U Now
> Twitter: @Illokatunow
> LAST LOVE
> Twitter: @LASTLOVE_0105
> Peter Pan
> Twitter: @peterpan0105
> YS900105
> Twitter: @ys900105_kr
> CLOSEUP
> Twitter: @closeup_ys
> TIME:RESET
> Twitter: @time_resetXD
> Sugarplum Boy
> Twitter: @sugarplum_ys
> I HAVE YYS
> Twitter: @ihaveyys
> Radiant Yoseop
> Twitter: @Radiant_ys
> YOSEOP THAILAND
> Twitter: @yoseopthailand
> Godsend Yoseop
> Twitter: @Godsend_yys
> PIYOPIYOYS
> Twitter: @piyopiyo_ys
> Light Delight
> Twitter: @lightdelight_kr
> Y-Bora
> Twitter: @Y_Bora
> Yobsession
> Twitter: @Yobsession
> LOVE YOU BABY
> Twitter: @yshoi0326
> THE WINTER 105
> Twitter: @thewinter_ys
> LUVSEOP
> Twitter: @Luvseop_
> One Feather
> Twitter: @onefeatherB2
> cozy place
> Twitter: @cozyplace_
> MY PRINCE
> Twitter: @myprinceys05
> Rosevly
> Twitter: @_Rosevly_
> Yosuniz (Fan community page)
> Twitter: @yosuniz
> YANG YO-SEOP SUPPORTERS (Fan community for Yoseob's support projects)
> Twitter: @support_ys
> YOman (Chinese Fan Blog)
> Twitter: @yoman19900105
> Weibo: yoman19900105
----- Personal Twitter Accounts > updates either on twitter or youtube
> @MakeitcountYS
> @LOVEYSMUCH
> @105C_YS
> @sweetnight0105
> @dailybaby_
> @ys_shot
> @_Aran_I
Kikwang (Aces)
> With-AJ (Gikwang's official fancafe)
> Twitter: @withGK_
> Human Tree
> Twitter: @humantree_gk
> BITNALEE
> Twitter: @BitNalee_gk
> Holiday
> Twitter: @holiday0330
> THE ONE
> Twitter: @GKisTHEONE
> Weibo: gkistheone
> Our Gikwang
> Twitter: @ourgikwang
> Sunshine Romance
> Twitter: @sunshineGK
> Countdown
> Twitter: @Countdown_GK
> Emotions GK
> Twitter: @Emotions_GK
> BROOMIE!
> Twitter: @broomie_gk
> CHADOPPA
> Twitter: @b2gk_haru > GKnight
> Twitter: @Gknight0330
> Weibo: gknight0330
> Romantic-gk
> Twitter: @ubin_hi
> Twitter: @janggu_gk
> Nine GK > Hit the SPOT!
> Twitter: @Ni_ne_GK
> TimeforGK
> Twitter: @timeforgk
> Kwangjang
> Twitter: @kwangjang0330
> Hyungkwang
> Twitter: @hyungkwang0330
> Luv GK
> Twitter: @yuni_luvgk
> Only GK
> Twitter: @shingingback
> Kwang-bar (baidu)
> Twitter: @kwangbar
> Weibo: kwangbar
> GKnight
> Twitter: @Gknight0330
> Weibo: gknight0330
> LeeGikwangHK
> Twitter: @gentlekiss_gkhk
> LEGENDofGK
> Twitter: @LEGENDofGK
> March-30th
> GK supporters in Japan
> Twitter: @AddictedtoGK
> nogikwangnolife
> Twitter: @nogikwangnolife
> Polaris GK
> Twitter: @GK0330_polaris
> Mina0615
> Twitter: @mina0615
----- Personal Twitter Accounts > updates either on twitter or youtube
> @GKing0330
> @onthemove_gk
> @amusing_day
> @_Temperature
> @starlike_gk
> @mensolaedam
> @GKlovable
Dongwoon (Swooners)
> dongnenuna
> Twitter: @Dongnenuna_DW
> charming namshin
> Twitter: @19910606_com
> on cloud nine
> Twitter: @OnCloudNine91
> cloud
> Twitter: @cloud910606_DW
> Always Dongwoon
> Twitter: @AlwaysDongwoon
> side by side
> Twitter: @SIDEBYSIDE_dw
> SOHNDAY
> Twitter: @mintyah
> Mind (coming soon!)
> Twitter: @Mind910606
> firstsight (coming soon!)
> Twitter: @firstsight_DW
> SOHNRISE (1st International FC of Dongwoon)
> Twitter: @sohnrisecom
Fansites for more than one member
DooJunSeung
> Red in Black (BEAST's 89-line Triple fanpage - Doojoon, Hyunseung & Junhyung)
> Twitter: @REDinBLACK89
DooJunKwang
> Woori (Doojoon, Junhyung & Kikwang)
> Twitter: @Woori_1004
2Jun
> AUDU (Doojoon & Junhyung)
> Twitter: @_audu1207
> Abutilon (Doojoon & Junhyung)
> Twitter: @Abuilon_Jun
DooSeob
> IDU (Doojoon & Yoseob)
> Twitter: @IDU_1016
> kong-dak (Doojoon & Yoseob)
> Twitter: @kongdak7415
> DYTREE (Doojoon & Yoseob)
> Twitter: @dytree_dy
> Romantist (Doojoon & Yoesob)
> Twitter: @Romantist_DY
> TWOSOME (Doojoon & Yoseob)
> Twitter: @89749015
> My Dream Boys (Doojoon & Yoseob)
> Twitter: @dreamboys7415
DooSeung
> Du Jang (Doojoon & Hyunseung)
> Twitter: @dujang89
DooKwang
> Melting Planet (Doojoon & Kikwang)
> Twitter: @melting_planet
> Carbonadu (Doojoon & Kikwang)
> Twitter: @CARBONADU
> Fatal Memory (Doojoon & Kikwang)
> Twitter: Doojoon - @BAWOO_DJ & Kikwang - @HANSEL_GK
JunSeung
> RoCo (Hyunseung & Junhyung)
> Twitter: Hyunseung - @Roco_Poly & Junhyung - @Roco_lolli
> TWINZ719 (Hyunseung & Junhyung)
> Twitter: Hyunseung - @twinz719_0903 & Junhyung - @twinz719_1219
JunSeob
> REALIST (Fan Community Page)
> JIHAZOO (Junhyung & Yoseob)
> Twitter: @jihazoo
> THE PARFAIT (Junhyung & Yoseob)
> Twitter: @the_parfait
JunKwang
> @SLOW STORY (Junhyung & Kikwang YT Video Account)
SeobWoon
> @diahnaya (Personal Account for Yoseob & Dongwoon although takes photos for OT6 as well)
KiSeob
> Ninetyday (Yoseob & Kikwang)
> Twitter: @ninetyday_ysgk
> With U ( Yoseob & Kikwang)
> Twitter: @WithU_90
*If you find any other fansites/blogs that you think should be added and if there are also inactive ones on this list that shouldn't be included anymore, please comment. As well as if you think some accounts here shouldn't be included or if you think there are other personal accounts out there that should be included.
