I’ll admit it: I was the student that tipped the teacher off that half of our English class, including me, was using SparkNotes to “read” “Twelfth Night” by Shakespeare, instead of actually reading the text itself. The site, which offered summaries of books on a chapter-by-chapter basis, was the best way to review novels before a quiz — or, was the best last-minute savior if you procrastinated too much and never got around to opening the book in the first place.