Typically don't just contain phone number or email, but also some other pieces of personal information. For example in this case it included at least the Facebo

Typically don't just contain phone number or email, but also some other pieces of personal information. For example in this case it included at least the Facebook user id. This can give other tidbits of info like when you established you account, about your education, about your age etc. Determined person can use the various leaks and other data sources to collect more detailed profile of you (and millions of others). This will eventually allow them to setup more targeted and personalized spam or phishing campaigns.