Joining LinkedIn, dating website eHarmony said Wednesday that it is investigating the possible theft of its members' passwords. The company, which claims it is responsible for five percent of U.S. marriages, tweeted that it is investigating the incident. According to reports, a dump on a Russian online forum that contained more than six million LinkedIn passwords, which were hashed but not salted, making them easy to crack, also contained the passwords of eHarmony users. Efforts to unscramble this list revealed that some of the passwords included "eHarmony" in them, indicating they were being used by members of the singles site.