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Groupon’s quarterly loss narrowed as the online-coupon service cut marketing costs but revenue growth continued to slow. Its shares tumbled after hours.

Election night unfolded as much on the Web as it did on TV. Many say the real-time conversations on social media were the real show... Right after the television networks projected that he had won reelection, the first thing President Obama did was thank supporters — not with a statement to the media or in an email, but in a tweet.

Shares in AOL have jumped 14% after the US internet firm reported a sharp rise in advertising revenues. Advertising sales jumped 7% to $340m (£212m), boosting net profit for the third quarter to $20.8m, compared with a loss of $2.6m a year ago.

Amy Jo Martin, founder of social media consultancy Digital Royalty and author of Renegades Write The Rules, says the best way to build a social media following is through sharing. She provides the following tips on how to provide quality content and build out your network.

Netflix is moving to protect itself against hostile takeovers, less than a week after activist investor Carl Icahn disclosed a stake of nearly 10 percent in the online video company. Netflix Inc. said Monday that it has adopted a shareholder rights plan, also known as a poison pill. Such a plan is designed to make it difficult or even impossible for someone to take over the company without an agreement from the board. When the provision is triggered, additional shares flood the market and make it prohibitively expensive for a takeover.

Several NBC websites were hacked on Sunday by a person or group calling itself "pyknic" and suggesting a possible link to the cyber-attack group Anonymous.

With only sporadic access to text messaging and the Web, many in Hurricane Sandy's no-power zone quickly cobbled together systems for passing along information and arranging when and where to meet.

The idea behind mobile payments currently holds more appeal than the reality does. Can Google change that? Retailer support for mobile payments is hard to find outside major metropolitan areas, and even then, the gaggle of tap-to-pay options means your favorite NFC-friendly store may not accept your preferred mobile wallet technology. If a new leak proves true, Google may have worked its way around the hurdle, albeit in an NFC-free manner.

For Web sites that depend on their ranking in search results, Google’s secret — and frequently fluctuating — search algorithm can evoke a complex blend of admiration and fear.

Facebook executives including Sheryl Sandberg have sold a portion of their stock in the social site as restrictions on insider sales at the company have lapsed.