Millions of Twitter users are unable to Tweet, reTweet, hash, @ and direct message their virtual friends Wednesday as the Twitter service and Twitter.com website were unresponsive.
Twitter co-founder Biz Stone told reporters that the site had been hit by a denial of service attack.
Twitter went down around 9:30 a.m. on Thursday. Service was restored briefly before the attack forced the service down again.
A denial of service attack is a common way to bring websites and computer networks to their knees by sending repeated — often a countless number of — requests to the website, bottling up bandwidth on the website literally like a clogged drain pipe.