The rules of Twitter are pretty simple: Keep your messages short and sweet, tweet regularly, and don’t just tweet about yourself. Below are 100 software companies (including app makers and SaaS providers) that are doing Twitter right.

actuateaddthisadobeanyDOAribaasanaaspectautodeskAvayaAvidbasecampblackboardblockchainBlurbbuffercheckpointsoftwareCiscocitrixcobaltcoinbasecommvaultConnectWisecontentlycscDassaultSystemesdomodropboxegnyteemcepicorevernotefiservgniphitachiHPservicesinforinstagramintergraphintuitkasperskykeeniokronosINClearnvestLithiumTechLogMeInmailchimpMcAfeemckessonMEDITECHMedseekmentorgraphicsmintnetappNewRelicofficeOpenTextoptimizelyOraclepathpeerindexPocketporchpreziQlikrdioRedHatresponsysRubiconProjectRunKeepersagesalesforcesapSASsoftwarescribdsendgridShazamskillshareskypeSkyscannerSnapchatSoundcloudsourcefirespiceworksSpotifystripeSWIFTsymantecteradataTibcotictailtindertrendmicroTumblrvinevisuallywebrootwebsenseWoltersKluwerzaarlyzendesk

These companies are clearly audience-aware, and they have not inflated their followers stats by following thousands of accounts. As a result, they have many followers who actually engage via replies and RTs.

Many of the names on this list will come as no surprise. Microsoft has a few entrants. Younger companies such as Snapchat are social media natives from the boss down, so they are naturally adept at Twitter.

Other big names in software failed to make the cut for a variety of reasons: Maybe they tweet way too much or their tweets are almost all self-promotion.

You can learn a lot about using Twitter the right way by watching what the best companies do. What follows is 100 companies, leading by example.

  • Actuate, @Actuate
  • AddThis, @addthis
  • Adobe, @Adobe
  • Any.DO, @AnyDO
  • Ariba, @Ariba
  • Asana, @asana
  • Aspect, @AspectSoftware
  • Autodesk, @autodesk
  • Avaya, @Avaya
  • Avid, @Avid
  • Basecamp, @37signals
  • Blackboard, @Blackboard
  • Blockchain.info, @blockchain
  • Blurb, @BlurbBooks
  • Buffer, @buffer
  • Check Point Software, @CheckPointSW
  • Cisco, @Cisco
  • Citrix, @Citrix
  • Cobalt, @adp_cobalt
  • Coinbase, @coinbase
  • CommVault, @commvault
  • ConnectWise, @ConnectWise
  • Contently, @contently
  • CSC, @csc
  • Dassault Systemes, @Dassault3DS
  • Domo, @domotalk
  • Dropbox, @dropbox
  • Egnyte, @egnyte
  • EMC, @EMCcorp
  • Epicor, @epicor
  • Evernote, @evernote
  • Fiserv, @Fiserv
  • Gnip, Inc., @gnip
  • Hitachi Data Systems, @HDScorp
  • HP Enterprise Services, @HPServices
  • Infor, @infor
  • Instagram, @instagram
  • Intergraph Corp., @intergraph
  • Intuit, Inc., @IntuitInc
  • Kaspersky Lab, @kaspersky
  • Keen IO, @keen_io
  • Kronos Incorporated, @KronosInc
  • LearnVest, @LearnVest
  • Lithium Technologies, @LithiumTech
  • LogMeIn, @LogMeIn
  • MailChimp, @MailChimp
  • McAfee Inc., @McAfee
  • McKesson Corporation, @McKesson
  • MEDITECH, @MEDITECH
  • MEDSEEK, @MEDSEEK
  • Mentor Graphics, @mentor_graphics
  • Mint, @mint
  • NetApp, @NetApp
  • New Relic, @newrelic
  • Office, @Office
  • OpenText, @OpenText
  • Optimizely, @optimizely
  • Oracle, @Oracle
  • Path, @path
  • PeerIndex, @PeerIndex
  • Pocket, @Pocket
  • Porch, @PorchDotCom
  • Prezi, @prezi
  • Qlik, @QlikView
  • Rdio, @rdio
  • Red Hat, @RedHatNews
  • Responsys, @Responsys
  • Rubicon Project, @RubiconProject
  • RunKeeper, @RunKeeper
  • Sage, @sageUK
  • Salesforce, @salesforce
  • SAP, @SAP
  • SAS Software, @SASsoftware
  • Scribd, @Scribd
  • SendGrid, @sendgrid
  • Shazam, @Shazam
  • Skillshare, @skillshare
  • Skype, @skype
  • Skyscanner, @Skyscanner
  • Snapchat, @Snapchat
  • SoundCloud, @SoundCloud
  • Sourcefire, @sourcefire
  • Spiceworks, @spiceworks
  • Spotify, @spotify
  • Stripe, @stripe
  • SWIFT, @swiftcommunity
  • Symantec, @symantec
  • Teradata, @Teradata
  • Tibco, @TIBCO
  • Tictail, @tictail
  • Tinder, @Tinder
  • Trend Micro, @TrendMicro
  • Tumblr, @tumblr
  • Vine, @vineapp
  • Visually, @Visually
  • Webroot, @Webroot
  • Websense, Inc., @websense
  • Wolters Kluwer, @wolters_kluwer
  • Zaarly, @zaarly
  • Zendesk, @Zendesk
  • Epic Presence Team