Facebook and Twitter are working together to figure out exactly which 15 year olds are responsible for organising yesterday's attack.

SHOOT: Notice Twitter and Facebook went wonky yesterday? Nicely done piece by Mr Fairweather here, Media24's social media guru, on what happened. You can follow Alistair here: www.twitter.com/afairweather

clipped from www.news24.com Yesterday, at around 14:00 GMT the productivity of office workers across Europe, Africa and the Middle East shot up. Monthly reports were finished, urgent e-mails were sent and the consumption of tea rose sharply. The cause? Facebook was effectively unavailable for several hours. But what unnatural disaster could have robbed us of our God-given right to super-poke our friends and stalk our ex-boyfriends during office hours? It was - wait for it - a co-ordinated attack by a zombie army. No, I'm not kidding. Yesterday thousands of normally friendly computers - purring happily in offices and studies around the world - turned suddenly bloodthirsty and simultaneously hurled themselves at Facebook and a number of other sites, battering them again and again until they ground to a halt. The technical term for this is a distributed denial of service attack (or DDOS). Patient hackers spend months infecting computers with tiny invisible programs called "worms" and "Trojans".