I think the risk is a lot higher than described by this post or dropbox. There are nearly 70 million credentials, and email addresses actually contain a fair am

I think the risk is a lot higher than described by this post or dropbox. There are nearly 70 million credentials, and email addresses actually contain a fair amount of heuristic information for an attacker. For example just filter down to addresses from hotmail or yahoo, and suddenly you have a list of credentials that are far more likely to be susceptible to a dictionary attack.