Update 12:13pm EST - Twitter.com is finally up for many users, DoS attack still ongoing. Facebook and LiveJournal also experiencing issues.
Update: 11:26am EST - Twitter says site is back up but they're still defending against the DoS attack. I personally can't access Twitter.com, can you? Leave a comment.
Twitter went down this morning and it's not the usual fail whale situation. Instead, Twitter issued a statement on status.Twitter.com that they're defending against a Denial of Service (DoS) Attack.
A DoS attack is a malicious attempt to bring down a website or application so that its users cannot access the service.
Twitter went down around 10am EST.
Stay tuned to Search Engine Watch as this story unfolds.
Introducing SES Online
Want to view one of the sessions you missed or listen to an especially informative presenter a second time? SES New York sessions are available for purchase on ClickZ Academy's new e-Learning site. SES is now Online!