
Quizlet users have a "dashboard" where they can track the flashcards they've made, public sets added to their collection, and track the flashcards they've studied. Quizlet also allows users to join study groups to share in the creation and studying of flashcards.
To learn more about using Quizlet, check out this short demo video.
Applications for Education
Quizlet's advantage over similar flashcard services is the option for student to play games using their sets of flashcards instead of just learning from rote memorization.
Unfortunately, because of some of the names of the public study groups on Quizlet I can't recommend having elementary or middle school students use Quizlet without direct supervision.
Here are some other flashcard creation tools you may want to consider using.
Knowtes
Muchobeets
Study Stack
Cramberry