[unreal37]

The customers were Twitter, Tumblr and Pinterest. Wow, three of the biggest customers they have probably.

And two, the body of the emails was not exposed, only the subject line. People typically don't but their SSN in the subject line...

[ams6110]

It doesn't sound like the investigation is complete, so we really don't know what was exposed. If this was a sophisticated intrusion, the attackers may have covered the evidence that a lot more was taken, but just didn't quite get it all cleaned up.