Yammer, Inc.
Type of business Subsidiary
Type of site
Enterprise collaboration
Founded September 2008 (2008-09)
Headquarters San Francisco, CA, US
Founder(s) David O. Sacks
Adam Pisoni[1]
Parent Microsoft
Website Yammer.com

Yammer ( /ˈjæm.ər/ ) is a freemium enterprise social networking service used for private communication within organizations. Access to a Yammer network is determined by a user's Internet domain so that only individuals with approved email addresses may join their respective networks.[2]

The service began as an internal communication system for the genealogy website Geni.com,[3] and was launched as an independent product in 2008.[4] Microsoft later acquired Yammer in 2012 for US$1.2 billion.[5]


On September 8, 2008, Yammer was launched at the TechCrunch50 conference after co-founder David Sacks,[4] a former PayPal executive, developed the basic concept of Yammer while working on a startup project after he left PayPal in 2002.[3] In addition to its communication function, Yammer also gives third-party developers the opportunity to create and sell their collaborative applications directly to users of the platform.[6]

By April 2010, Yammer CEO Sacks claimed that Yammer revenue was doubling every quarter, but would not disclose revenue figures for 2009 beyond describing it as "seven figures." Sacks also stated that 70 percent of Fortune 500 companies were using Yammer at that time.[7]

In September 2010, the service was being used by more than three million users and 80,000 companies worldwide, including 80 percent of the Fortune 500.[6] During this period, Yammer 2.0 was launched and the new version was described as a "Facebook for the Enterprise".[8]

As of June 12, 2012, Yammer has received around US$142 million in funding from venture capital firms such as Charles River Ventures, Founders Fund, Emergence Capital Partners, Goldcrest Investments, and Ron Conway, an angel investor,[9] while the total number of subscribers is close to 8 million.[10]

On June 25, 2012, Microsoft acquired Yammer for US$1.2 billion.[11][12] Following the acquisition, Microsoft announced that the Yammer team would be incorporated into the Microsoft Office division, but would continue to report to Sacks.[13]

On July 24, 2014, Microsoft announced that Yammer development was being moved into the Office 365 development team, and Sacks announced that he was leaving Microsoft and Yammer.[14]


Yammer has been criticized for enabling employees within a company to begin conducting business on their platform, but then charging these same companies for taking ownership of the content or removing former employees from accessing internal corporate communication.[15]

See also


  1. "Yammer Executives". Yammer.com. Retrieved June 29, 2012.
  2. Chacos, Brad (August 7, 2012). "What the Heck Is Yammer?". PC World. IDG Consumer & SMB. Retrieved June 25, 2013.
  3. 1 2 Welch, Liz (November 2011). "The Way I Work: David Sacks, Yammer". Inc.com. Mansueto Ventures LLC. Retrieved June 25, 2013.
  4. 1 2 Schonfeld, Erick (September 8, 2008). "Yammer Launches at TC50: Twitter For Companies". TechCrunch. Palo Alto, California.
  5. Lietdke, Michael (June 25, 2012). "Microsoft Buys Yammer For $1.2 Billion". The Huffington Post. Retrieved June 25, 2013.
  6. 1 2 Rao, Leena (September 28, 2010). "Yammer Debuts A Facebook For The Enterprise". TechCrunch. Palo Alto, California. Retrieved October 15, 2010.
  7. Arrington, Michael (April 26, 2010). "Yammer Doubling Revenue Every Quarter, No Fear Of Salesforce". TechCrunch. Palo Alto, California. Retrieved January 21, 2011.
  8. Nakano, Chelsi (September 30, 2010). "Enterprise 2.0 Roll-up: Yammer Turns Facebook, Mobile Outshines Social Media Tools". CMS Wire. Simpler Media Group, Inc. Retrieved October 15, 2010.
  9. "Yammer". CrunchBase. June 12, 2013. Retrieved June 25, 2013.
  10. Lunden, Ingrid. "A Year After Microsoft Bought It, Yammer Nears 8M Users, Deeper MSFT Integration… And Klout". TechCrunch.
  11. Israel, Shel (June 25, 2012). "It's Official: Microsoft Buys Yammer for $1.4 Billion Cash". Forbes. Retrieved June 29, 2012.
  12. "Yammer: Microsoft's billion-dollar social bid". The Christian Science Monitor. Retrieved July 10, 2012.
  13. "With $1.2 Billion Yammer Buy, Microsoft's Social Enterprise Strategy Takes Shape". TechCrunch. Aol Tech. June 25, 2012. Retrieved June 25, 2013.
  14. Foley, Mary Jo (July 24, 2014). "Microsoft moves Yammer under Office 365; Co-founder David Sacks is out". ZDNet. Retrieved July 25, 2014.
  15. "Yammer's Game Plan: CEO David Sacks Explains All - InformationWeek". InformationWeek. Retrieved August 4, 2017.
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