Is Twitter Down? The answer is YES. http://istwitterdown.com/ as of 10:30 AM EST on Thursday August 6, 2009
According to twitter’s status page they are in the midst of fighting off a Denial Of Service Attack. http://status.twitter.com/
What is a DDoS Attack you may ask.
Well according to Wikipedia:
A denial-of-service attack (DoS attack) or distributed denial-of-service attack (DDoS attack) is an attempt to make a computer resource unavailable to its intended users. Although the means to carry out, motives for, and targets of a DoS attack may vary, it generally consists of the concerted efforts of a person or persons to prevent an Internet site or service from functioning efficiently or at all, temporarily or indefinitely. Perpetrators of DoS attacks typically target sites or services hosted on high-profile web servers such as banks, credit card payment gateways, and even root nameservers.
So there you have it. I’ll let you know more when I know more.
Update: It appears Twitter is back up for the moment. 11:48 EST