Including Twitter, Facebook, Yammer and Instant Messaging. Collaboration software like Jive Software, Yammer and Chatter offer activity stream as a separate product. Notable users include Microsoft Office, Yammer, and Zendesk. Yammer also launched their own app store which included Crocodoc and Zendesk. Yammer also released their SharePoint 2007 Integration, and moved to Scala for their real-time work. On June 25, Microsoft paid US$1.2 billion to buy the social network Yammer. During this period, Yammer grew its userbase to 4 million total users. Currently Yammer is included in all enterprise plans of Office 365 and Microsoft 365. In 2008 Yammer was built as an internal feature for Geni by David O. Sacks. There was renewed focus on the Yammer Embed Feed. Microsoft later acquired Yammer in 2012 for US$1.2 billion. Social Capital invested in Yammer in 2011, which was later bought by Microsoft. Yammer Notifications was released as a replacement to YammerFox. In 2009 Yammer went through its first redesign. Yammer was also purchased by Microsoft for US$1.2 billion.