twitter.com/Google – our central account
twitter.com/Blogger – for Blogger fans
twitter.com/GoogleCalendar – user tips & updates
twitter.com/GoogleImages – news, tips, tricks on our visual image search
twitter.com/GoogleNews – latest headlines via Google News
twitter.com/GoogleReader – from our feed reader team
twitter.com/GoogleVoice – updates & info on Google Voice*
twitter.com/iGoogle – news & notes from Google’s personalized homepage
twitter.com/GoogleStudents – news of interest to students using Google
twitter.com/YouTube – for YouTube fans
twitter.com/YouTubeES – en Espanol
twitter.com/GoogleAtWork – solutions for IT and workplace productivity

Geo-related
twitter.com/SketchUp – Google SketchUp news
twitter.com/3DWH – SketchUp’s 3D Warehouse
twitter.com/Modelyourtown – 3D modeling to build your favorite places
twitter.com/EarthOutreach – Earth & Maps tools for nonprofits & orgs
twitter.com/GoogleEarth – updates from the Google Earth team*
twitter.com/GoogleMaps – uses, tips, mashups
twitter.com/GoogleSkyMap -Android app for the night sky

Ads-related
twitter.com/AdSense – for online publishers
twitter.com/AdWordsHelper – looking out for AdWords questions and tech issues
twitter.com/AdWordsProSarah – Google Guide for AdWords Help Forum
twitter.com/GoogleAnalytics – insights for website effectiveness
twitter.com/GoogleAdBuilder – re building display ads
twitter.com/GoogleAffiliate – info for publishers from Google network advertisers*
twitter.com/GoogleRetail – for retail advertisers
twitter.com/GoogleTVAds – info on our digital system for more measurable TV advertising*
twitter.com/TechnologyUK – for U.K. tech advertisers
twitter.com/UKretail – for U.K. retail advertisers
twitter.com/creativesandbox – for advertising agencies*
twitter.com/InsideAdWordsDE – for German AdWords customers
twitter.com/GoogleAgencyDE – for German ad agencies
twitter.com/AdSensePT – info for Portuguese-language publishers
twitter.com/AdWordsRussia – AdWords news & tips in Russian
twitter.com/DentroDeAdWords – Spanish updates from the Inside AdWords blog
twitter.com/AdWordsAPI – AdWords API tips

Developer & technical
twitter.com/GoogleResearch – from our research scientists
twitter.com/GoogleWMC – Google Webmaster Central
twitter.com/GoogleCode – latest updates for Google developer products
twitter.com/GoogleData – Data APIs provide a standard protocol for reading and writing web data
twitter.com/app_engine – web apps run on Google infrastructure
twitter.com/DataLiberation – our initiative for complete import/export of all data
twitter.com/GoogleMapsAPI – about using Google Maps embedded in websites
twitter.com/GoogleIO – Google’s largest annual developer event

Culture, People
twitter.com/googletalks – notes from our @Google speaker series
twitter.com/googlejobs – the voice of Google recruiters

Country or Region
twitter.com/googlearabia – news from the Google Arabia Blog*