Seems like the whole world is a’tweet with using Twitter as a way to build conversation around a brand, so we pulled together a list of some major ad agencies that are participating in this popular new wave of Social Media. Feel free to comment below if you see anything missing or have one to add to the list.

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Big Traditional Agencies:
BBDO: http://twitter.com/BBDOMPLS
Dentsu: http://twitter.com/dentsu_america
EURO RSCG: http://twitter.com/EURO_RSCG
Leo Burnett: http://twitter.com/mr_burnett
McCann Erickson http://twitter.com/McCann_NY
Oglivy: http://twitter.com/OGILVY
Publicis: http://twitter.com/PublicisUSA
TBWA: http://twitter.com/TBWA
Wieden & Kennedy: http://twitter.com/FakeDanWieden

Interactive Agencies:
2 Advanced Studios: http://twitter.com/2advanced
14Four: http://twitter.com/14four
AdAsia: http://twitter.com/adasia
Agency Republic: http://twitter.com/agencyrepublic
Agency.com: http://twitter.com/agency_com
AKQA: http://twitter.com/AKQA
Balcom Agency: http://twitter.com/balcomagency
Big Spaceship: http://twitter.com/bigspaceship
Blitz Agency: http://twitter.com/blitzagency
Bouthouse Group: https://twitter.com/boathouseinc
Branded Evolution: http://twitter.com/brandedevo
Critical Mass: http://twitter.com/criticalmass
CScape: http://twitter.com/cscape
DBS Interactive: http://twitter.com/DBSInteractive
Design Kitchen: http://twitter.com/designkitchen
Digitas: http://twitter.com/Digitas
Draft FCB: http://twitter.com/Draftfcb_Press
GSD&M Idea City: http://twitter.com/IdeaCity
IconNicholson: http://twitter.com/iconnicholson
iCrossing UK: http://twitter.com/icrossing_uk
imc2: http://twitter.com/imcsquared
Launch Interactive : http://twitter.com/launchint
Macquarium: http://twitter.com/Macquarium
MediaFront: http://twitter.com/mediafront
MGH: http://twitter.com/mghus
Nemo: http://twitter.com/nemohq
New Media Strategies: http://twitter.com/nmsosphere
Nurun: http://twitter.com/nuruncareers
Organic: http://twitter.com/organicinc
R/GA: http://twitter.com/_RGA
Razorfish: http://twitter.com/Razorfish
Rhyme and Reason Design: http://twitter.com/rymeandreason3
Rockfish Interactive: http://twitter.com/RFInteractive
Seventhpoint: http://twitter.com/seventhpoint
Struck Creative: http://twitter.com/struckcreative
T3Think Tank: http://twitter.com/t3thinktank
TBG London: http://twitter.com/tbglondon
Think Pop: http://twitter.com/thinkpop
Tequila: http://twitter.com/TequilaDigital
Tocquigny: http://twitter.com/Tocquigny
Web.com: http://twitter.com/webdotcom

Boutique Agencies:
7th Wave Creative: http://twitter.com/7thwavecreative
Agancia (Brazil): http://twitter.com/agencia
Allen & Geresten: https://twitter.com/allengerritsen
ASI: http://twitter.com/ASI_was_saying
Bergman Group: http://twitter.com/bergmangroup
Brunner: http://twitter.com/brunnerworks
The Butler Bros: http://twitter.com/abutlerbro
Cliff Freeman and Partners: http://twitter.com/cliffbot
Damashek Consultin: http://twitter.com/damashek
Dare Digital: http://twitter.com/daredigital
EB Lane: http://twitter.com/EBLane
Element 79: http://twitter.com/element79sez
I Am Group: http://twitter.com/rachael_miller
Juxt Interactive: http://twitter.com/juxtinteractive
HipCricket: http://twitter.com/hipcricket
Kuno Creative: http://twitter.com/jmctigue
Lowe: http://twitter.com/lowe_sydney
The Martin Agency: https://twitter.com/MartinTweets
McKinney: https://twitter.com/mckinneychicago
Mind Clay: http://twitter.com/mindclay
MMB: http://twitter.com/PeterTwombly
MobiMarket : http://twitter.com/MobiMarket
Modernista: http://twitter.com/modernista
Moosylvania: http://twitter.com/moosylvania
Odopod: http://twitter.com/odopod
Phire Branding: http://twitter.com/phirebranding
PJA: http://twitter.com/agencypja
Polka Dot Peeps: http://twitter.com/polkadotpeeps
Red Square: http://twitter.com/redsquareagency
Saatch NZ: http://twitter.com/saatchidgs
Sitewire: http://twitter.com/sitewireagency
Slingshot LLC: http://twitter.com/slingshotllc
Small Army: http://twitter.com/smallarmyagency
Thinking Juice: http://twitter.com/thinkingjuice
They Inspire: http://twitter.com/theyinspire
Work at Play: http://twitter.com/workatplay

Media Agencies:
Incognito Digital: http://twitter.com/IncognitoDigtal
MindShare: http://twitter.com/MindshareGlobal

Other:
American Association of Advertising Agencies: https://twitter.com/4As