Maybe you know, maybe you don't but they got hacked by a this guy. Apparently they have no idea how it happened. But it seems they stored the hashes, and everything on the same place, like some site worded it:
Just a heads up if you have an account on the site change your password because it took me two minutes tops on Google to find over 10.000 emails, password hashes and salts. While to the amateur like myself that gives no meaningful info it's very possible for someone that knows what he's doing to get the passwords.Originally Posted by Some site
Here are links to GR's articles about it.
The second one is self-explanatory but it would be irresponsible not to do it...