This is a pretty impressive success for Anonymous, taking down a very prominent site.
In an attack it is calling “Operation: Payback”, a group of online activists calling themselves Anonymous appear to have orchestrated a DDOS (“distributed denial of service”) attack on the site, bringing its service to a halt for many users. Attempts to load www.mastercard.com are currently unsuccessful.
Interestingly, this is sandwiched half-way between being a mass action, and being merely the work of a small, elite group of hackers. I’m not sure what system they’re using, but the ‘distributed’ element of the DDoS almost certainly comes from thousands of /b/tards running some code on their own machines. For that matter, it could well be that a bunch of them are sitting on mastercard.com and hitting refresh.
Mastercard statement: “MasterCard is experiencing heavy traffic on its external corporate website – MasterCard.com. We are working to restore normal speed of service“