The data is a apparently a subset of 60 million records that the hackers are threatening to release.
I've had a look at the data, there are very many easily identifiable people, for some of those there is date-of-birth data, ZIP code, "preferences", details of any money spent etc. There are a few people using their .gov email addresses for this, some of those can be verified by the IP address, some other email addresses belonging to other corporations. I would suspect that those are the people who are most at risk of blackmail. Remember too that an email addresses can be used to look people up on Facebook, which would make it easier for blackmailers to find potential victims.
Not revealed in the breach (so far) are credit card data, real names (although many are obvious from the email addresses) or passwords. Although I notice that some people were smart enough to sign up with a throwaway email address, if they have actually paid for anything then they would have had to supply real contact details somewhere.
The background story appears to be that a pissed-off affiliate who claims they were owed hundreds of thousands of dollars had a contact hack the database. It seems the hackers are demanding money else they will release the rest of the data.