The possibility of a cyber-attack on the world's ever more interlinked energy system is another concern.
After its servers came under heavy cyber-attack this week, it rented space from Amazon.
However, the deal collapsed three days after the cyber-attack, Bloomberg said, citing internal sources.
America, as the country most reliant on computers, is probably most vulnerable to cyber-attack.
"Should such systems suffer a sustained cyber-attack, their ability to operate could be fatally compromised, " the report stated.
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This is not the first time Twitter has been hit with a cyber-attack.
These anxiety-producing consumer annoyances occur over a backdrop of increased cyber-attack news.
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Following Wednesday's attack, the KCC raised its cyber-attack alert levels to "caution, " the third highest out of five levels.
The White House has confirmed it was the target of a cyber-attack but says the breach hit an unclassified network.
The internet around the world has been slowed down in what security experts are describing as the biggest cyber-attack in history.
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Mr Clarke has long spoken of the vulnerability of the US to a cyber-attack, especially considering the country's reliance on computer networks.
Israel has dismissed suggestions that it might be behind the Flame cyber-attack.
The report warned that much more needed to be done to identify the type or extent of cyber-attack that would warrant a military response.
BBC: UK 'complacent' over military cyber-attack risk, MPs warn
The President of the United States even has the authority to green-light preemptive strikes against a credible, impending cyber-attack, according to the NYT article.
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There are wider issues: did the cyber-attack on Estonia, a member of NATO, count as an armed attack, and should the alliance have defended it?
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The key difference between last week's two IT bloopers is that the cyber-attack was exogenous while CBOE's software glitch and subsequent slow response were internal issues.
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The hack came a week after social-networking firm Facebook said it had traced a cyber-attack back to China after some of its employee laptops were hacked.
So says the BBC, that the internet is currently suffering under the largest cyber-attack yet known and that this is slowing down traffic and sites right across the internet.
FORBES: The Biggest Cyber-Attack Ever Is Slowing Down The Internet
Stewart Room of Field Fisher Waterhouse said there was now a need for an amnesty - instead of punishment - for companies that suffered a data loss or cyber-attack.
America, according to Secretary of Defense Leon Panetta is at severe risk from cyber-attack, and DHS has indicated that we are short at least 30, 000 security professionals.
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Kazuo Hirai, Chairman of the Board of Directors of Sony Computer Entertainment America, submitted written answers to questions posed by the subcommittee about the large-scale, criminal cyber-attack we have experienced.
North Korea has not commented on the cyber-attack accusation.
The UK government has placed the potential cost of a single corporate cyber-attack in the hundreds of millions and it's not just traditional technology and internet-based companies that are at risk.
Initially, South Korea's Communications Commission suspected a cyber-attack.
Election day started with a massive cyber-attack that brought down the websites of Ekho Moskvy, a popular radio station, and of Golos, an independent election monitor that Mr Putin had likened to Judas a few days earlier.
Companies say they are under constant cyber-attack in ever more ingenious forms, but they are loth to say in public how often the raiders get through and how much damage they do assuming that the breach is spotted.
The testimony also comes in the wake of a report from the Pew Internet and American Life Project that cited a prediction by technology experts that a catastrophic cyber-attack that causes significant losses in life and financial damage would occur by 2025.
This paradox is at the heart of what looks like a big cyber-attack by China (or Chinese hackers) against the private e-mail accounts of hundreds of senior officials, military types and journalists from America and Asian countries, chiefly South Korea.
While the nature of this threat landscape is uncertain, the potential damage a cyber-attack could pose to our internet-dependent telecommunications, power and even water infrastructure, has seen cyber security rise sharply up government agendas around the world in the last five years.
The troubles of the electronics giant began in late April when an outage of the PlayStation Network in late April was revealed to be the result of a massive cyber-attack which had put the data of 77 million Sony customers at risk.
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