This week in tech news – Yahoo! to Buy Tumblr, Apple iOS Use Approved by DOD, YouTube Turns 8.

Yahoo! to buy Tumblr
Yahoo Inc. is making a bold move in an effort to increase its marketing appeal. In a $1.1 billion acquisition of Tumblr, a trendy social blogging outlet, Yahoo Inc. hopes to grip the young adult online audience. While this is an enormous cash deal, investors are backing the decision of CEO Marissa Mayer. Since she took over, Yahoo Inc.’s stock has surged 69%.

Apple iOS Approved by U.S. Department of Defense
Until now, devices built on Apple iOS have not been approved by the U.S. Department of Defense. As of Friday, the DOD had approved the Apple iOS 6 Security Technical Implementation Guide. Blackberry and Samsung devices were recently approved for use as well.

Happy Birthday, YouTube!
Eight years ago, on May 19th, YouTube launched its video sharing service.