Hackers don't take a holiday, it seems.
Hours after Microsoft's Xbox Live went down earlier today, Sony's PlayStation Network is now down, too.
Like the earlier incident, the notorious hacker group "Lizard Squad" is claiming responsibility for taking down PlayStation Network on Twitter, saying it has downed both networks with DDoS attacks - basically, intentionally overloading servers by sending a flood of bogus web traffic.
"Lizard Squad" issued a threat last week that it would take down the PlayStation and Xbox Live networks over Christmas. Another hacker gang, called "The Finest Squad," had apparently exposed several Lizard Squad identities online, and it also learned that Lizard was taking the big game networks using DDoS attacks.