An interesting article from the New York Times: The Age of Schadenfreude, written by Philip Corbett.
According to Corbett, the word schadenfreude, was not used once in the paper in 1980. What does the word mean? Per Wikipedia, the sociologist and philospher Theodor Adorno describes it as “largely unanticipated delight in the suffering of another which is cognized as trivial and/or appropriate.”
Barnett recounts that the first usage of the word is in a 1985 William Safire “On Language” column. In 1990, the term had been used 3 times, including usage by native German speaker. By 2004, it had been used 40 times in a single year.