It infected thousands of Twitter accounts, even reaching the White House itself. But the virus that caused havoc on the microblogging site was not started by a shadowy group of hackers - it was discovered by a 17-year-old schoolboy.
Australian Pearce Delphin has admitted he kicked off the worm which sank Twitter for five hours.

Users were redirected to porn sites or shown pop-ups when they moved their mouse over certain content, or Twitter messages were automatically retweeted as the site went into meltdown.