Twitter sued the US government Tuesday, claiming its free speech rights are being violated by restrictions on its ability to disclose numbers of secret orders to hand over user data.

Drivers using hands-free virtual assistants like Apple's Siri can be distracted by the technology, creating safety hazards, according to a study released Tuesday.

Glasses that tell you how to get home, adverts that know where you are looking and a T-shirt that knows how fast your heart is beating were on display at a huge tech gathering in Japan Tuesday.

Smartphones, tablets and other gadgets aren't just changing the way we live and work. They are shaking up Silicon Valley's balance of power and splitting up businesses. Long-established companies such as Hewlett-Packard Co. and eBay Inc. are scrambling to regain their footing to better compete against mobile-savvy trendsetters like Apple and Google, as well as rising technology stars that have built businesses around "cloud computing."

That term covers a swath of Internet-driven services that shifted technology from the days software users paid a one-time fee to buy and install programs on individual machines where they also stored all their data on hard drives. But with the advent of the "cloud," people can now rent software to use over the Internet. This enables customers to access documents, pictures and other vital information from any kind of Internet-connected device, a convenience that's become a necessity during the past few years as people increasingly rely on smartphones and tablets instead of laptop and desktop computers.

Two new studies have found that voice-activated smartphones and dashboard infotainment systems may be making the distracted-driving problem worse instead of better.

The systems let drivers do things like tune the radio, send a text message, or make a phone call while keeping their eyes on the road and their hands on the wheel, but many of these systems are so error-prone or complex that they require more concentration from drivers rather than less, according to studies released Tuesday by the AAA Foundation for Traffic Safety and the University of Utah.

Bidding for a rare prototype of Apple's new-generation iPhone 6 neared a whopping $100,000 on eBay Monday, after the device appeared to have accidentally landed in a buyer's hands.

Facebook on Monday completed its buy of mobile messaging application WhatsApp, with the mostly stock deal tallying nearly $22 billion.

Hewlett-Packard is splitting itself into two companies, one focused on its personal computer and printing business and another on technology services, such as data storage, servers and software, as it aims to drive profits higher.

The company laid off tens of thousands of people in recent years as sales crumbled, with customers shifting to mobile devices like smartphones and computer tablets. That has drastically curbed demand for HP's desktop and laptop computers, as well as its printers.

The Eiffel Tower is set to inaugurate a new glass floor on Monday that is turning the heads of the millions of tourists who flock to Paris's best-known landmark every year.

Paris Mayor Anne Hidalgo will later Monday officially open the renovated first level of the most visited paying monument in the world, which visitors could begin enjoying last month.

China is waging an aggressive cyber-war against the United States which costs American business billions of dollars every year, Federal Bureau of Investigation director James Comey said Sunday.