Carla Marshall wrote on ReelSeo.com about a data breach involving 5 million Google email addresses. She also included a link to a website that supposedly will let you know if your Google account is open to being comprised. So you might want to change your passwords.

Google said the following, The security of our users is of paramount importance to us. We have no evidence that our systems have been compromised, but whenever we become aware that an account has been compromised, we take steps to help our users secure their accounts.

From the article:

5 million Google email addresses, usernames and passwords have been leaked to the outside world, via a Russian Bitcoin forum.

The leaked list is now off-line, and many of the passwords leaked have been collected over the past few years, so if you have updated your Google log-in details very recently then you are probably OK. If you haven’t updated your password in years, then now might be the time to a) do that as well as enable the two-step authentication feature, and b) check this site to see whether your Google account is open to being compromised (warning: that site is crashing all over the place at the moment so be patient).