On Neowin, Brad Sams has notified on some ugly news:
“Over two million passwords for Yahoo!, Facebook, Twitter, LinkedIn and others have been posted to the web after a botnet has infected thousands of machines and used a keylogger to obtain passwords. While this breach is not from any particular service, the botnet has clearly been running effectively for some time as it reportedly has over 2 million passwords, 300,000 of which are for Facebook accounts.”
So, if you suspect your account has been hacked, change passwords immediately. Also,
use the online scanners at Kaspersky (or elsewhere) and scan for keystroke loggers since that’s how these minions of the dark side worked their evil.