Lily Hay Newman put together a great guide to data breaches. It covers the history of breaches like Equifax, Marriott, Quora, and others.
Think of data breaches as coming in two flavors: breaches of institutions that people choose to entrust with their data—like retailers and banks—and breaches of entities that acquired user data secondarily—like credit bureaus and marketing firms.
Check It Out: Security Week: Check Out Wired’s Guide to Data Breaches