PayPal has been under attack ever since they stop taking payments for Wikileaks donations. This time a 4-Chan’s Anon has actually succeeded in taking the site down. As of right now they PayPal site is not responding. MasterCard and Visa have also been under DOS attacks all day as well. Anon had been blocked on Twitter.com and Facebook earlier today which he then proceeded to attack Twitter. Twitter never went down in the attack, probably because their network has a large enough pipe to handle it but the image below shows that it actually had some effect on the servers.
Twitter image credit: TNW