A tweet containing a snippet of computer code propagated itself through Twitter by taking advantage of a security flaw in the company's TweetDeck application.
In response, Twitter shut down the application's access to tweets for about an hour while fixing the problem.
We've temporarily taken TweetDeck services down to assess today's earlier security issue. We'll update when services are back up.— TweetDeck (@TweetDeck) June 11, 2014
The two-line message was automatically "retweeted," or sent out again, when received by TweetDeck, a computer application for Twitter's power users. Affected tweeters saw pop-up windows on their screens. The tweet was sent out tens of thousands of times, but left its victims otherwise unharmed.
Twitter initially told TweetDeck users to log out and log back in. When that proved ineffective, it shut down the application's access to tweets. Twitter was still accessible through its website and through other applications.
We've verified our security fix and have turned TweetDeck services back on for all users. Sorry for any inconvenience.— TweetDeck (@TweetDeck) June 11, 2014