[astatine]

The 3.8B numbers is really meaningless, in isolation. This is the problem of plenty - 10K numbers with a very specific profile might be a lot more valuable. The real worry would be the info on the relationships between the numbers (which number is connected to whom). This leak seems to have a count of relations rather than the actual connections.

[axegon_]

Well the facebook data that was published everywhere earlier this year could hold some value when combined with this one: While the facebook data is somewhat outdated, I'm pretty sure you'd get millions of people with relevant and up to date information.