A vulnerability in Twitter’s TweetDeck tool caused trouble for many users on Wednesday. A researcher tweeted the vulnerability early Wednesday morning, setting off a wave of online conversation. Many users had unknowingly tweeted out code that could lead to future XSS attacks. Tweetdeck did not disclose the details of how many users were affected or the number of active exploits found to be using the vulnerability. Security expert: “This worm hearkens back to the MySpace ‘Samy Worm’ in 2006″”]