Google unveiled its much-anticipated digital music store Wednesday, opening a new front in its battle with Apple to provide services over mobile devices.

For the first time, Google Inc. will sell songs on the Android Market, its online store for apps, movies and books. The service is available over the next few days to customers in the U.S., but it aims to roll it out eventually to some 200 million Android users globally.

Microsoft chief Steve Ballmer proclaimed an everlasting "Windows Era" as the software giant's board easily won re-election at an annual meeting of shareholders on Tuesday.

Ballmer along with Microsoft co-founder Bill Gates, Netflix co-founder Reed Hastings and six others saw their positions on the Microsoft board secured with more than 92 percent of votes cast by investors.

A Japanese company Tuesday unveiled a cheap Geiger counter for the iPhone to enable people worried about the March Fukushima nuclear accident to check their environment for radiation.

The probe, 14 centimeters long by five wide (six inches by two), connects to the iPhone and the screen displays radiation readings in combination with a special app such as the Geiger Bot.

Sony, Toshiba and Hitachi on Tuesday said they had signed a deal to merge their small and medium-sized liquid crystal display businesses for smartphones and tablet computers.

The move will create a new company, Japan Display, by Spring 2012.

Facebook said Tuesday that a "coordinated spam attack" was responsible for graphic images appearing in the news feeds of some members of the world's largest social network.

Facebook, which has more than 800 million members, said some users of the social network were tricked into unknowingly sharing the offensive content.

Author Salman Rushdie has won a tussle with Facebook over his profile page on the social network.

Rushdie's run-in with Facebook stemmed from his insistence he be allowed to use his middle name -- Salman, the one he is universally known by -- instead of his first name -- Ahmed -- on Facebook.

The Walt Disney Co. said Monday it has bought Babble Media, an online hub for parents featuring more than 200 "mom blogs."

Disney did not announce a purchase price for the acquisition of the New York-based Babble Media.

Google tops the list when it comes to where U.S. business students want to work after graduating, according to a survey released on Monday by brand specialty firm Universum.

The California-based Internet firm placed among the top 10 "ideal employers" for college students in an array of majors including liberal arts, natural sciences, and information technology.

Twitter on Monday finished adding features that let users see who likes their posts and what the people they follow are doing at the popular micro blogging network.

"You can now see when someone favorites (likes) or retweets one of your Tweets," the San Francisco-based startup said in a blog post when the changes began rolling out in August.

A look at some of the major differences between Amazon.com Inc.'s tablet computer, the Kindle Fire, and Apple Inc.'s popular iPad:

Price: The Kindle Fire, which connects to the Internet over Wi-Fi networks, costs $199. The iPad costs $499 to $829, depending on storage capacity and its wireless capabilities. Some iPad models can access cellular networks.