More than anything else, people are missing Menstrual Cycle. It's the most missed term on Quizlet, with 188 incorrect scores logged. That's just funny :)
Also near the top of the list, is Jefferson City → Missouri. I guess we can call that the least well-known of the US State Capitals. Sorry, Jefferson City.
The award for the most used set on Quizlet goes to Reprise Ch. 23 - Relative Clauses. Second place goes to the previously mentioned US State Capitals list.
Sixteen is the most common age among Quizlet users, with 387 users. Runners up are 15-year-olds, 17-year-olds, and 26-year-olds. This data is from the birth year entered when users sign up.
The user with the most terms entered is suresh, who has imported some very large word lists. He comes in at 11,034 terms.
I may only have entered 3,118 terms, but no one is touching my 68 created sets.
Finally, one last statistic that consistently blows me away is that even though I created Quizlet, I'm not its biggest user. That honor goes to my good friend KevinFace.
Well that was fun. Perhaps I'll make this a regular thing State of The Quizlet item. Let me know if there's any other interesting data you think would be cool to find.