Suffering from “hallucinogenic optimism,” the C.E.O. of Twitter started off by watching what other entrepreneurs were doing and trying to play along.

A panel voted the Internet as the biggest innovation of the last three decades, followed by computers, mobile phones and e-mail.

The popularity of Facebook and other social networking sites has promoted the sharing of all things personal, dissolving the line that separates the private from the public.

Law enforcement agencies are beginning to use the Web to compare notes on crimes and help track suspects.

Our love of cellphones is spawning applications for driving that can be downloaded for little or no money.

Poker players share their hard-luck tales online.

How a struggling Boston painter finally found success through his alter ego -- a hip, virtual-world art-scene maker.

With a popular product aimed at information technology managers, the software company Spiceworks also provides a concentrated audience for eager advertisers.

Electronic medical records are supposed to transform our broken health care system, but we should not sacrifice too much for them.

Experts say the law requiring notice of certain kinds of layoffs should be overhauled to cover smaller job cuts.

BlackBerry will open its own App store, but details are scant.

A licensing agreement could lead to the creation of a new premium Web site for music videos.

Google is spending $7 million on a global print campaign to alert writers that it intends to digitize every book.

Vivek Kundra, 34, the chief technology officer for the District of Columbia, will be expected to oversee a push by the federal government to expand uses of cutting-edge technology.

The Museum of Modern Art’s new site, which makes its debut on Friday, is an almost complete reconstruction of how the museum presents itself online.

Owners of iPod and iPhone Touch can download free software that will provide access to the 240,000 e-books on Amazon.com.

Hotels, conference centers and event organizers struggle to provide enough Net access for corporate clients.

A hybrid boat engine is one part of a multimillion-dollar government-led effort to address rising energy costs.

To fill more seats, theater producers are stepping up their online presence in an effort to spread word of mouth among Internet users.

The Dutch industrial giant is moving away from home electronics and toward the next generation of light bulbs and hospital scanning and monitoring equipment.