Courtesy of, here’s a quick rundown of the latest technology news in Silicon Valley:

Microsoft announced Monday that it has entered into a definitive agreement to pay $1.2 billion for San Francisco-based enterprise social network provider Yammer.

Tesla delivered its first round of Model S sedans to 10 customers who have been awaiting the arrival of their new electric sedans since throwing down a $40K deposit.

Twitter blamed its nearly two-hour global shut-down, which began Thursday at 9am PDT, on a “cascading bug” that made the site appear frozen on mobile devices and inaccessible to PC-based Web users.

Stanford University partnered with Piazzo, a Palo Alto-based social learning platform, for the popular App Development course for the iPhone and iPad offered on iTunes U. Piazzo will make it possible for students to communicate with one another about class topics.

Santa Clara-based Agilent Technologies Inc. completed its acquisition of cancer diagnostics company Dako.