According to a report in ReadWrite:
Have a Google, Facebook, Twitter, LinkedIn, or Yahoo account? If so, you might want to change your password, stat. According to cybersecurity firm Trustwave, hackers using a nasty piece of work called the Pony Botnet Controller have stolen usernames and passwords for nearly two million accounts. The firm determined that a malicious keylogger installed on users’ computers was to blame.
In addition, CNN reported that the accounts hacked were: