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Gmail credentials leaked

The usernames and passwords of almost five million Gmail users have been published, most of them from Russia. Although approximately the 60% of this accounts would be valid, Google has published a post in its blog indicating that only about 2% of the published credentials might have worked. Many of the attempted logins were also blocked by Google's security systems.
In the same post, Google states that this information leakage has not been produced by a security breach in their servers. Instead, the published credentials would have been obtained through other methods (like usernames and passwords shared with other services).