You might think your password protects the confidential information stored on Web sites. But as Twitter executives discovered, that is a dangerous assumption. The Web was abuzz Wednesday after it was revealed that a hacker had exposed corporate information about Twitter after breaking into an employee’s e-mail account, The New York Times reports. The breach raised red flags for individuals as well as businesses about the passwords used to secure information they store on the Web. On Web sites containing personal information like e-mail, financial data or documents, there is usually just a user name and password for protection. More individuals are storing information on Web servers, where it is accessible from any online computer through services offered by Google, Amazon, Microsoft, social networks like Facebook or back-up services like Mozy.