Anonymous-affiliated groups have today claimed credit for the dump of tens of thousands of names, email addresses and corresponding passwords from PayPal and computer-security firm Symantec, and for attacks on Australian government sites. There are plans to stage a "V for Vendetta"-style non-violent march on the Houses of Parliament in London this evening.

The PayPal data dump was announced on multiple Anonymous Twitter accounts. PayPal denied any data breach and said that an investigation into reports of the attack hadn't found "any evidence that validates this claim."

The increase in Anonymous activities overall, however, is hard to deny. A hacker known as Pyknic, thought to be associated with Anonymous, purportedly defaced Lady Gaga's website and several websites belonging to NBC Universal. The defaced sites included the official "Saturday Night Live" site, preventing some users from streaming the show late on Sunday North American time.