If they really hacked ALL these websites they claim they did, 13k account informations means they got almost nothing from each website. Nonetheless, it's worth a change of password, but they seem like a bunch of kids...
I was thinking the same thing. But better to know, than not know.
It appears this is only a combination of past leaks. For example:http://www.databreaches.net/verifying-leaks-uncovers-fake-leaks/