Data breach just doesn't do this justice.
1.2 Billion Web Credentials Said To Be In Russian Gang's Hands
Over 400,000 web site were compromised over a six month period. The gang, about a dozen hackers from south central Russia, managed to accumulate over 1.2 billion account names with passwords. At this point you don't ask "Was I hacked?" because the answer is effectively "Yes." Even if you weren't directly attacked someone you know was and you could've already been sent spam from them with a virus or Trojan horse in it and not have known.
So, my fellow Kossacks, your job for today -- change your web passwords. All of them.