Do this now if you’re a Gmail user, change your password! At least 5 million usernames and passwords were been leaked on a Russian forum!
And tell your friends too! Though the list has since been removed, the genie is out of the bottle.
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Most sources are saying that lots of the information is quite old, so chances are they were leaked long ago—though others are claiming 60% of the passwords are still valid (not to mention really, really horrible). source
There is a tool to check if your password was one of the leaked, but rather than waste time doing that, you may also want to change your password STAT!