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The micro-blogging site has to deal with both a phishing scam and a hack of high profile accounts.
Many people are unaware that even smoking away from babies or pregnant women presents a risk, according to US research.
Venezuela's US-based oil subsidiary is halting a programme to provide cheap heating oil to low-income communities in the US.
US President-elect Barack Obama has picked former Clinton chief of staff Leon Panetta to head the CIA, Democratic officials say.
US prosecutors call for Bernard Madoff to be put in prison until his trial after it emerges he sent jewellery and watches to friends and family.
Cuba opens up electronic access to thousands of documents belonging to writer Ernest Hemingway.
US President-elect Barack Obama is seeing Congressional leaders to discuss his stimulus plan, which reports say could total $800bn.
The US is to establish "the largest area of protected sea in the world", banning fishing and mining, around its Pacific islands.
Concern for Steve Jobs amid the Macworld buzz
A recount in the US state of Minnesota confirms its Senate seat was won by a Democrat but the result is still contested.
A type of iguana missed by Darwin during his Galapagos trip promises to rewrite the animal's history in the islands.
US carmakers report sharp falls in their sales in December as the economic slowdown drives customers away from showrooms.
US President-elect Barack Obama has chosen former White House chief of staff Leon Panetta to head the CIA, US media report.
The US Congress begins an inquiry into a suspected $50bn (£32bn) fraud allegedly run by the American hedge fund manager, Bernard Madoff.
Japanese carmaker Subaru sees US sales climb in 2008, amid grim sales figures in the rest of the industry.
Why Obama has stayed silent over the Gaza crisis
US President-elect Barack Obama's daughters Malia and Sasha begin their first day at school in Washington DC.
US President-elect Barack Obama is due to meet Congressional leaders to sell them his multi-billion dollar stimulus package.
At least 22 people die and dozens more are missing after part of a mountain collapses onto a road in northern Guatemala.
Steve Jobs, head of Apple, has disclosed in a statement that he is being treated for a hormone imbalance.
The new US embassy in Baghdad - one of the largest and most expensive ever built - is officially opened Iraq's capital.
Which issues are top of Barack Obama's to-do list?
Oscar-nominated actor Sam Shepard is arrested for allegedly drinking and driving in the US state of Illinois.
More than 50,000 people are expected at the Macworld show this week for the final year that Apple will take part.