Most readers of this site will know what Twitter is and probably use it on a regular basis but for those that don’t, it is a micro-blogging site where the articles are 140 characters or less.  It’s popularity is gaining rapidly due to how quickly content spreads and how easy it is to use.

More and more companies are now using Twitter, some of which are good at it and others need some work.  One of the best groups of companies on Twitter to follow are Security and Anti-Malware companies.  When there is an outbreak they can help you to stay informed and get you the information to either stay uninfected or for how to clean the newest malware out there.

I have compiled this list after quite a bit of research and while I am sure I have found the bulk of AV/AS companies on Twitter I would appreciate others adding to it as well.  If you know of any that are missing from this list please leave their usernames in the coments section or send me a message @pfoty.

@AdAware – New account with only a Hello World post but expected to be very active soon.
@Atribune –  Has not been used  in 6+ months
@AviraAntivir –  Mostly software update information
@avgsecurity
@officialAVGnews – Almost all marketing information
@bitdefender – Very active and has excellent information
@CASecurity – Lightly used and mostly just CA related updates
@CiscoSecurity – Not just information about Cisco , includes a lot of security information.
@clamav – Only sends out updated deffinition information. Does not follow back.
@comodogroup
@DriveSentry – New account but off to a very good and active start
@Fortinet
@kaspersky – Relatively active account with lots of good information
@lavasoft – Marketing information and rarely used
@Malwarebytes – Protected and un-used but might be used in the future
@McAfeeAvertLabs – Active account deffinetly worth following
@McAfeeNews – McAfee related news updates
@Panda_Security – Very active account and has been around longer than most of the others
@PandaSecurityZA – South Africa branch of Panda but different content and less active
@PandaTechSup
@PCToolsDoctor – Not currently very active
@PCToolsSupport
@ScanSafe
@SophosLabs
@SPAMfighter – Extremely active account and is not exclusively about Spam
@SpybotSD
@Sunbelt_Support
@sunbeltsoftware
@symantecnews
@threatpost – Kaspersky site  feed
@TrendMicro – Relatively active account with good information
@webroot
@websenselabs
@WinPatrol

Many companies such as Symantec and Sunbelt have a lot of employees on Twitter that are very active but as of yet do not have the most active of corporate Twitter accounts.  I spoke with some employees of the companies on this list and most of them indicated that their companies Twitter accounts were going to be very active in the next couple of months but were waiting for resources to be dedicated to it.  This is good news especially when it comes to accounts like Lavasoft where the accounts are brand new with little to no content yet.

I have tried to limit this list just to actual security AV/AS companies but I will be adding another list this week of excellent people to follow in the malware industry.  Many of these people such as  @MalwareCity are websites dedicated to malware information and really offer a wealth of information for those seeking it.

As always if you would like to follow me on Twitter you can do so by going to @pfoty.  Following a lot of people on Twitter can be difficult but as someone who follows 700+ people I think the best way is with a program like Twirl.  It installs to your computer and makes it more like an instant messenger client rather than just a website.

UPDATE:: I have added Drive Sentry, ThreatExpert and PCToolsSupport to the list.  As people send me others I will continue to add them to the list so make sure you check back and get the updates.