Barnes & Noble said Thursday it is reviewing its options for its Nook e-book and e-book catalog business and might separate it from its core bookstore business.

The company also lowered its yearly guidance. The news sent shares down 30 percent in morning trading.

Yahoo's previous turnaround attempts have flopped under three different leaders with dramatically different backgrounds — former movie mogul Terry Semel, beloved Yahoo co-founder Jerry Yang and profanity-spewing Silicon Valley veteran Carol Bartz.

Now, the struggling Internet company is making yet another unorthodox choice with Wednesday's announcement that it has lured Scott Thompson away from a lower-profile job running eBay's thriving PayPal service to step into the pressure-packed position as Yahoo's fourth CEO in less than five years.

Former Cuban leader Fidel Castro is "laughing" off rumors about his death that went viral on Twitter, an official Cuban blogger said Tuesday.

"Fidel Castro studied, analyzed and is laughing at the rumors on Twitter," wrote Yohandry Bloquera on his blog (www.yohandry.com). "The CIA tried to kill him more than 700 times and Twitter is going down that road."

Research In Motion vowed Tuesday to defend the legal privacy rights of BlackBerry users after a judicial commission in Pakistan ordered copies of smartphone communications in a scandal probe.

The Canadian firm reacted to news that a Pakistani commission was seeking records for a probe into an unsigned memo purported to ask for Washington's help to rein in Pakistan's military.

Six Nigerian nationals have been arrested in the Indian city of Mumbai on suspicion of defrauding hundreds of people through text message and spam email scams, police said.

The group was picked up from three properties in a north Mumbai suburb on New Year's Eve, officers said late Monday. All six have been remanded in custody until January 12 pending further investigations.

Nintendo on Tuesday announced that it sold more than four million of its sophisticated 3DS handheld videogame gadgets in the United States by end of 2011.

Consumers also snapped up versions of beloved "Mario" franchise videogames tailored for the handsets, which feature 3-D graphics without need of special glasses.

The fight to fully legalize online gambling in the U.S. is now less about whether Americans will be able to play and more about who will bring the action to them — and when.

A recent U.S. Justice Department opinion opened the door for cash-strapped states and their lotteries to bring online gambling to their residents, as long as it does not involve sports betting.

A self-defined Saudi hacker claimed he had published details of 400,000 Israeli-owned credit cards online, but the card firms on Tuesday insisted that only 14,000 cards had been affected.

Details of the hack were exposed late on Monday in a statement posted on an Israeli sports website.

Hackers launched a series of New Year's Day attacks that temporarily shut down several Philippine government websites including the office of the vice-president, officials said Monday.

Vice President Jejomar Binay said hackers calling themselves the PrivateX group brought down his official website for 15 hours Sunday and denied access to mostly migrant Filipinos checking on his office's activities.

Facebook co-founder and chief executive Mark Zuckerberg has deflected talk of going public for years but it looks like it is finally going to happen in 2012.

"The Facebook IPO will be the biggest financial event in the tech industry for 2012," Forrester Research analyst Josh Bernoff said, and one of the biggest initial public offerings ever in the United States.