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A watchdog group says Twitter lags behind Facebook, Bebo and other social networks when it comes to protecting children from abuse.

The London-based Child Exploitation and Online Protection Centre said it believes some pedophiles still use the site to discuss crimes against children and link to pornographic images, despite efforts by Twitter to act immediately when it receives complaints about such activity.

In a statement Del Harvey, Twitter's Director of Trust and Safety, said "we receive a report and identify it as valid, we take action immediately."

If you fancy yourself a law enforcement computer forensics examiner, then you might want to sign up for this year's Defense Department DC3 Challenge. There is no prize purse for winning, other than bragging rights and free passes to various computer security conferences, but it represents a unique public hacking challenge that has been going on for several years now. You have between now and the end of October to get your submission ready, and it will take a significant amount of effort to prepare your entry, just so you know.

In what appears to be a growing trend, displaced employees are turning to cybercrime using their corporate data access to steal, exploit and damage information networks, and may have cost businesses as much as $1 trillion globally according to a new study from McAfee and Purdue University's Center for Education and Research in Information Assurance and Security

Although insiders have always posed a threat to information security, the report warns that the global recession is putting vital information at greater risk than ever before.